C2 or iy Abe jee ide wy “rity ea —— oe seas eas 2 2 Siri. ess : ‘ : f : e : aay ie SSS } . ¥ S r Y Saye r es b = we an a a + ‘ SSS ES f : Af eomremes Saligee 22 Nise So wn f fey lan sate ae ° ~ KO eee tia ey a 2 —= = : Z tas - nN AN, Fasryd > - ' \ 7 ' ) e i s > , _ BIRD BEHAVIOUR a \ 5 YOUNG OF BARN-OWL. Although\their white down is very different from the feathers of the old birds these nestlings have the face just like the adult. bags " g So AUTOR ELON eR ON ARETE EER OE TUNER 2 Ce: a - ——— Ve ae TYPES OF PHEASANTS. Argus (top left), Golden (top right), Mikado (centre), Silver (bottom), showing different styles of masculine decoration. Frontispiece. BIRD BEHAVIOUR PSYCHICAL AND PHYSIOLOGICAL BY FRANK FINN, B.A. (Oxon), F.Z.S. Late Editor of ** The Zoologist” AUTHOR OF ‘‘BIRDS OF THE COUNTRYSIDE,” ‘‘EGGS AND NESTS OF BRITISH BIRDS,” ‘‘THE WORLD'S BIRDS,” ETC... ‘¢ Behold the fowls of the air.”—St. MATTHEW Vi, 26 WitH 44 ILLUSTRATIONS ~~ ART PAPER NEW YORK DODD, MEAD AND COMPANY aged (a) z he ea Ba SE RAS pel 4 CONTENTS CHAPTER I Importance of subject—Incompleteness of our information about even the commonest species—Distinction between major and minor habits—General activities or tricks of manner— Greater importance of the latter in classification—Errors to be avoided in observation . : : : pp. I-12 CHAPTER II The locomotion of birds—Hopping and walking—Reasons for adoption of these gaits—Why waterfowl waddle—Swimming and diving—Perching and climbing—Different methods of performing these actions—Specialized birds which have taken to different habits, as Ground-Parrots and Land Geese—Flight and its varieties—Characteristic methods according to group and size—Sailing and soaring flight—Speed . pp. 13-32 CHAPTER III The nutrition of birds—Various kinds of food, animal and vege- table—Methods of and adaptations for obtaining it—Changes of diet—Gluttony of some species—Power of discrimination among foods, both vegetable and animal—The much-discussed relations of birds to insects, especially butterflies pp. 33-76 Vv — = SES = ~~ vi “CONTENTS CHAPTER: IV Nutrition (continued)—Manipulation of food—Powers of diges- tion, differing in different groups—The formation of pellets or castings—Difference in the food of old and young in some cases—Different methods of feeding the young—Young assist- ing parents in feeding their juniors—Feeding of each other by the sexes—Drinking, and eating of such substances as salt and earth . : : - - - » pp. 77-112 CHAPTER V Propagation—Care of young—Different types of young birds— Different modes of feather-development, as seen in young Fowl, Pigeon, or Duck, for instance—Egg-coloration and its meaning and variations—Prolificacy and otherwise—Incuba- tion mounds—Periods of incubation . » pp. 113-165 CHAPTER VI Propagation (continued)—Nest-making not purely a bird-habit— Eggs laid without nests—Types of nests—Parasitic nesting— —Parasitic layers, like Cuckoos and Cow-birds—Degrees of development of parasitic instinct . ‘ . pp. 166-205 CHAPTER VII Migration—An anciently observed phenomenon still imperfectly understood—Reasons for it—Methods as far as is known— Difference between migratory species and the homing Pigeon - —Widespread tendency to migration, contrasted with con- tradictory tendency to form localized non-migratory races, ending in some cases in flightlessness, as in some birds of remote islands . ‘ : 4 ‘ : pp. 206-224 Dg EONAR CONTENTS vil CHAPTER VIII The senses of birds—Sight and its general high development— Degree of perception of colour—Influence of colour, if any, on courtship, and the segregation of species—Perception of the’ colour in various kinds of food—Smell, usually poorly developed—Exceptions noted—Acuteness of hearing—Sense of touch—Taste-perceptions SNe - Ppp. 225-254 CHAPTER IX The emotions of birds—Mentality higher than is supposed, but variable according to species or groups—Strong- and weak- minded birds—Intelligence and stupidity—The limitations of instinct—Expression of the emotions and its relation to courting displays—Love and sociability—Hatred and re- venge—The police instinct—Monogamy, polygamy, and polyandry—The problem of preferential mating pp. 255-280 CHAPTER X Song and cries of birds—Bird-language generally—Extent to which the notes are instinctively developed—The instinct of mimicry—Species which can imitate human speech—Problem of this ability and extent of exercise of the same—Possibility of understanding of bird-language by man . pp. 281-292 CHAPTER XI Weapons and fighting methods of birds—Their combats with | each other and with various natural enemies—Chief enemies of birds—The passive resistance of birds to unfavourable climate and surroundings—Natural defences—Perfection and degeneracy of plumage in this connection—Powder-coating of some groups . : ‘ ° : » Ppp. 293-302 rw —_—— eC lhl vill CONTENTS CHAPTER XII Special instincts of birds—The play of young birds and of adults —Bower-builders and their peculiarities—Ornamentation of nests—The instinct for food-storage in some forms—The practice of piracy—Toilet and bed-time habits pp. 303-318 CHAPTER XIII Special physiological peculiarities of birds—Longevity—Tempera- ture of body—Change of colour in bare skin of some, such as Turkey—The phenomena of the moult—Gradual change in colour of bill and feet according to age and sex or season —Changes in iris colour—Beak-sheath shedding as in Puffin pp. 319-328 CHAPTER XIV Abnormalities—Hybrids, their characteristics and power of repro- duction or otherwise—Abnormal plumages, such as albinism or melanism, temporary or permanent—Overgrowth of claws and bill ° e € e e ° . PP- 329-342 CHAPTER XV Relations of birds with men—Persecuted species—Parasitic or commensal species—Domestic forms—Introduced forms and the results of introduction . Z é - pp. 343-356, INDEX . : : : i p - pp. 357-363 ILLUSTRATIONS Younc or Barn-Ow1 . : . Back of Frontispiece Types oF PHEASANTs . : : : Frontispiece FACING PAGE THe Brrp-Cotony 1n THE CatcutTra Zoo . Se i) Nest oF SociasLeE WEAvVER-Birps : : Be 7 PuFFIN A é _ : . ‘ ; HA Great Brack WoopPEcKER ; : Les AN a MERGANSER 1 5 ! : Se ai RIN SHOVELLER . : : : ; : : WTS FLAMINGOES : : : ; : : Dy haa AvocET : ‘ : ‘ . ; : Bn Ae Huta (FEMALE) . : : : : ania s, Huis (Mate). SOT : : : 0 gO HERON i ‘ : an Ws : : SG Rutnoceros HornBiLy ; : ‘ : : 47. SPOONBILL . é st Rel A ; : : Seay’ yg PEREGRINE Fatcon : : : : RON yg FLAMINGO . : . A : ; Sia RuinocEeros Hornsitts ‘ | , : SL Toco Toucans . : ‘ ‘ : 4 AUNT ix x ILLUSTRATIONS FACING PAGE Lyre-Birps (MALE AND FEMALE) : : eae SA. IMPERIAL WOODPECKERS. : : ? 55 Bourv Friar-Birp . : : ; : MeO Bouru ORIOLE, SHOWING RESEMBLANCE TO FRIAR- Birp, ; : : : : d ay, 33 Younc Hoatzin . , : : : : Min 32 BrusH-TuRKEY . : : P : : ot 33 OveEn-Birp . : i : : : : lS 3 Concave-CasqueD HornBiLy : : . ety 170 Brazitian Hanc-NEst coe era ‘tee oe Ue Types oF PensitE NEsts . ; : : 1,580 Nest oF CENTRAL-AMERICAN SWIFT. : Bee Bed GuacHARos AND NEST : : : : | ESA! Fiaminco on 1Ts NEst : : : ‘ 54) SWIFTLETS AND THEIR NEsTs : : : 185 Hawx-Cuckoo-or “ Brain-Fever Biro” . - 3Oe SHIKRA Hawk . e : ; ; : : “195 American Kinc-Birp . : . , : xohee Krnc-Crow : Veae nae ‘ ; 5 25 27o AFRICAN JACANA . Ba: é - 296 Cusan Trocon . 2 : g oy) aaa 5 | BOF GARDENER BoweEr-BirD witH Irs BowER . mr one) NewrTon’s Bower-Birp Paige: : ; ie HyBrID BETWEEN GOLDEN PHEASANT AND FowL . 330 Herrine GULLs . ; : , ‘ : ete BIRD BEHAVIOUR . CHARTER I Importance of subject—Incompleteness of our information about even the commonest species—Distinction between major and minor habits—General activities or tricks of manner— Greater importance of the latter in classification—Errors to be avoided in observation. Tue study of birds is often looked down upon by general zoologists as a trifling pursuit, and the reason of this is not far to seek; what is called zoology nowadays is for the most part the study of com- parative anatomy, and from this point of view birds are of extremely small interest ; they are remarkably uniform in their general structure, and such varia- tions of note as do occur are chiefly confined to a few flightless families, such as Ostriches and Pen- guins. : One need not, indeed, be an anatomist to realize the comparatively small structural interest of birds ; a bird is at once and by everybody recognized as such, while among the mammals, their rivals in high development, one gets such extraordinarily different types as whales, mice, bats, horses, lions, ; | 2 BIRD BEHAVIOUR and men, most of which differ from each other more than the earliest known bird, the Archaeopteryx of Jurassic times, does from the modern Sparrow in the back-garden. On the other hand, the numerous species and families of birds and their close alliance with each other afford, by this very narrow range of differentia- tion, an attractive and philosophical study ; among them survive types which in mammals have become “missing links ’’ or are only discoverable in the fossil state. In fact, it is the survival of so many connecting forms that makes it so difficult to group the families of birds into larger “‘ orders,” a difficulty which only occurs with mammals when we look back among their fossil predecessors preserved among the rocks. We look, for instance, with interest upon the remains of the various ancestral predecessors of the horse family, as exhibited in museums, and try to realize what changes of habit must have occurred to convert a small animal with paws into a large one with a single hoofed toe on each foot. But among the birds, if we go to the Duck family (Anatide) we find still in existence practically all the links between a light-bodied, large-winged bird with non-waterproof plumage and _half-webbed feet with large grasping hind-toe, and almost exclusively aquatic diving Ducks which rival the Grebes and Cormorants in their subaqueous per- formances, and exhibit almost as much modification of structure. And the habits of these can be DUCKS AND EVOLUTION 3 studied, for they are not only living, but accessible ; the semi-wader at the beginning of the series, the Australian Magpie-Goose (Anseranas semipalmata) is no rarity, and I have spent much time in study- ang a full-winged specimen at Kew, while the habits of many others of the family exemplifying the gradations I have mentioned are accessible either to direct observation or to any one who can look up bird literature. In fact, the Duck family is one of the most inter- esting of all animal groups for any one interested in biological problems, owing to the wide distribu- tion of its members, their essential and obvious alliance combined with equally striking differences —some obviously adaptive, others more inexplicable —and I shall have a good deal to say about them in the course of this book, especially as they are familiar exhibits in many public parks, and thus available for everybody’s observation. The availability of birds, as a class, for study gives them, in fact, an importance in the study of animal habits which fairly outweighs their insignificance from the morphological point of view; and I personally have never admitted that the study of structure is more important than that of habit, considering that it only acquires its pre-eminence from the fact of demanding a professional training which is the prerogative of a few only. When one comes to think of it, we ourselves only surpass the other mammals in virtue of our habits, being structurally simply monkeys on our hind legs; yet 4 BIRD BEHAVIOUR he would be a bold zoologist who would claim that comparative anatomy is a more important study than that of the manifold activities of mankind. If one admits that the study of habit is to be taken seriously—and of late there has been a decided trend in that direction—bird-watching needs no apology, for the habits of birds are of manifold variety, and not by any means fully understood, even in the case of the commonest and most familiar species. In fact, these are sometimes, perhaps, less well understood than the comparatively inaccessible ones ; it has often struck me, in view of the excellent observations that have been made of late years in the Antarctic by various expeditions, that we know more about the mind and life of the Adélie Penguin, one of the remotest birds on the globe, than we do about those of the Peacock, the best known by sight - and reputation of all birds for a couple of thousand years. | And here one must bear in mind that an observer should be no respecter of persons ornithologically ; a bird is not necessarily more worth observing because it is difficult of access, and that naturalist was very unscientific who said about the Sparrow, “‘ I have got into the habit of not noticing this bird.” Per- sonally I am always seeing something fresh in the humble Sparrow’s performances, and though my taste as a fancier lies in the direction of birds of beauty, I must.admit that the humbler species are often more interesting. But they are not necessarily so; dowdiness is no more a sign of FREE AND CAPTIVE BIRDS 5 intellect in a bird than in a human being, and Aristotle was quite right in stigmatizing some birds as “ dull in colour and leading a dull life,” while some of those which are stigmatized as “ garish”’ possess habits and qualities of surpassing interest, the Peacock in particular. I particularly mention the Peacock, because it is a purely Indian bird, but widely diffused about the world in a domestic state; but its domestication is not rigorous, so to speak, and it is allowed to lead practically a natural life. ‘This needs to be noticed, because there is a . regrettable tendency among naturalists to confine their observations to the wild birds native to their own country, to the neglect of introduced, domes- ticated, and captive species. A free bird is, of course, other things equal, the best and most instructive subject for observation, and many habits can only be observed on birds in a state of liberty, and in their own country at that ; but nevertheless, many very interesting hints may be gleaned from the study of birds not so situated, and these may always be checked by the study of their recorded habits in a natural state. Where such records do not exist, the study of captive birds is a useful stimulus to field observers to take up the matter, and often an observation on a tame or captive bird brings out a point which the field observer almost necessarily overlooks, owing, in many cases, to want of opportunity to discriminate between individuals—a point which will become evident later on. 6 BIRD BEHAVIOUR The best of all birds for observation are, of course, those which live in a tame but free state in their own country, such as Wood-Pigeons in London, and House-Crows (Corvus splendens) in Indian towns, though even here the difficulty of identifying individuals is a drawback. ‘The growing practice of ringing birds, however, which is proving so useful in throwing light on problems of migration, will probably be of service in making records of individual birds in the near future, and in this connection it is worth noting that spring net-traps can be obtained in which many species of birds can be readily captured without injury for this purpose. In considering the habits of birds we have to realize that they fall into two categories, which may perhaps be called major and minor habits, or per- haps, habits and customs. By major habits I mean the leading and conspicuous life-activities of a species; its food, manner of nesting, mode of association (solitary or gregarious), etc. On these its life obviously depends, and to them its structure is often plainly adapted. Yet, as its life depends on the adjustment of its main activities to its sur- roundings, it is just these habits that are particularly liable to vary even in a state of nature, and especially so under the influence of man’s interference, direct or otherwise. Habits of this sort are fairly, though not completely known in the case of a vast number of birds, but will always require study, as they are so subject to modification by circumstances. The minor habits, or mannerisms as we should VERSATILITY OF SPARROW 7 call them in the case of persons, are not nearly so familiar, and have not been worked out fully even in many very well-known birds. Such are pecu-_ liarities in gait, flight, and other actions; attitudes under emotion, positions assumed in repose, etc. Often these have no apparent connection with any necessity, and they are practically invariable for the species and often for the group, and not alter- able by circumstances. To take a concrete instance; the common Spar- row, as every one knows, eats seed, for the cracking of which its bill is specially adapted; it perches in trees, and has feet adapted for grasping twigs ; it also builds its nest in trees, and associates in pairs and flocks. ‘These are its major habits, and every one knows they are subject to modification ; it eats many things besides seed, especially remnants of man’s food; it builds under eaves as well as among boughs, and will sleep in its nest or in a crevice of a wall, as well as on a twig, in spite of its grasping feet. In spite of its short wings, it chases insects in the air, and hovers and drops on them in long grass like a miniature Kestrel. In other words, its major activities are, though to some extent correlated with its structure, highly © variable, and this, no doubt, is one great reason for its success as a species. If actively interfered with by man it can vary still more; a hand-reared Sparrow has been known to acquire a Linnet’s or Canary’s song. In some points, however, the Sparrow is invari- 8 BIRD BEHAVIOUR able; it never acquires the habit of holding down its food with one foot, though this would be of vital importance to it in enabling it to consume large articles of food when perched on a small bough, and thus escape risk of ground enemies. Though largely a ground-feeder, it hops and does not run, and does not hold up its tail to keep it clear of wet; when courting it has a definite display, with wings lowered and head and tail raised. It rolls in dust as well as washing, a com- bination of habits rare among birds, and when scratching itself it lowers its wing and raises its foot over it. Some of these minor habits may have significance, but this is not obvious ; what is obvious is that they are common to all Sparrows, and are often group-characters; thus, all the vast’ group of generally small birds—the Passerines, of which the Sparrow (Passer) is type and name-father — seem | to drop a wing when-scratching. Habits of this ) kind do not alter even in captive birds, although they may learn strange habits of feeding and nesting, and even alien songs. | Hence such characters are often useful in classi- fication, just as anatomical characters or inconspicu- ous external ones are of more importance than the general contour. Thus, all anatomists of late years have impressed upon us that the Swallows and Swifts must not be considered near relatives because of their similar forms—long-winged, small- footed, and short-billed—since these may be ac- counted for by adaptation to a similar life spent in SWIFTS AND SWALLOWS 9 chasing flying insects, and the anatomical characters of the Swifts differ from those of the Swallows, which present no important internal differences from the ordinary small passerine birds. ‘There are small differences also in external characters which are not to be correlated with modes of living ; the Swifts have but ten tail-feathers to the Swal- lows’ twelve, and have not the scales on their shanks which are usualin birds. ‘There is also a conspicuous difference in habit which seems to have no relation to utility, and hence is more likely to be a family character; in flight the Swallow every now and then draws in its wings to its sides—it still shows a sign of the typical small passerine bird’s flight with its occasional dips with closed wings—while the Swift always keeps its wings fully expanded, whether skimming motionless or renewing its impetus by means of wing-beats. Small details of habit are thus always worth observing, as they may be more significant than they seem, and in any case are good practice in observation. Some pitfalls in observation or in drawing con- clusions from the same need mentioning in con- clusion. ‘The danger of the major habits becoming modified in captivity or domestication has been alluded to, and is, indeed, made rather too much of by some writers ;_ still, it is well to bear it in mind. There is also the difficulty of the field observer in discriminating between individuals—often between the sexes, when these are alike. One must never on fe) BIRD BEHAVIOUR assume anything; if a bird is displaying, it is not necessarily a male, for instance. Quite apart from the fact that in many species the hen is the dominant sex, as in Phalaropes and Cassowaries, the hen may display even in those in which the male is well differentiated and very self-assertive; thus, I have seen a Peahen display to a Peacock, and a hen Turkey to the gobbler, these males in both cases remaining passive, so that had the sexes been alike, one would certainly have been tempted to draw very false conclusions about their behaviour. Then one must be very cautious in keeping free from prepossessions; it is quite easy to see what is not there, if one has some image already in one’s mind. We laugh at the error of the old naturalists who credited the Osprey, as a fishing- bird-of-prey, with one taloned foot and one webbed one; these odd extremities no doubt seemed to them appropriate, but I have seen almost equally gross instances of faulty observation of points of form and colour in the work of modern naturalists of the best repute. : Such errors can, of course, easily be checked, but when it comes to actions, unless the camera is at hand for the recording of such (which can be but rarely the case), the evidence is necessarily dependent on a number of witnesses. Every one is liable to err, and any observer is liable to have the opportunity of observing an action or occurrence which is rare © or strange, and will be disbelieved until some one else arises to confirm it, OI ‘s1oyIeqd jo siied ‘SJUCIOTUIOD JIeMC pue SUOIOH-JYSIN JO Stoquinu yenbo ynoqe Jo pasodurod sem Auojoo siz, ‘00Z VILNOIVO AHL NI ANOTOO-GuId AHL MOT YPYTAN ee eed WEAVER-BIRDS. was the old name for this Weaver, which is a plain-plumaged, ST OF SOCIABLE NE can Grosbeak “a 2 lee = —_ mee - ; ; : SSS eye Aap — Sparrow-like bird. 37 ** Republi INCONSISTENT CORMORANTS II One should thus be very careful in discrediting the observations of others if they do not happen to agree with one’s own, especially if such were recorded many years ago; a record is not necessarily bad because it is ancient, nor good because it is new. Even one’s own observations may contradict ' each other at times, as happened to me in my experience of our wild colony of the small Indian Cormorant (Phalacrocorax javanicus) in the Calcutta Zoo. ‘These birds came in the evenings to their roosting-place on a wooded island in a large pond, and usually swooped down, Swallow-fashion, to take a drink on the wing before going up to roost. This was an unusual feat for a Cormorant to per- form (although it must be remembered that this species is a light-built, long-tailed bird of only the size of a Teal), and, from the way in which the birds began to gape before touching the water, and often involuntarily checked their way so much that they had to settle after all, they evidently found it a dificult one. It so happened, too, that once for some time they gave the habit up, and settled in flocks in the water to drink in the normal way, though they afterwards resumed the custom of the flying sip; and I can well imagine that any one who had seen them thus drink sitting would put down my record of the flying drink as most far-fetched and out of all congruity with the structure and habits of a Cormorant. Very likely the birds had adopted a really new habit, in drinking flying; at any rate, we know Ag 12 BIRD BEHAVIOUR new habits do occur—I rather fancy that I dropped across one of late, in finding the Sparrows peeling off the inner bark of the limes for nesting-material, even when they could easily get straw, and I find the habit not uncommon in the Regent’s Park district, as many barked branches testify. There is, therefore, always room for observation, confirmatory or original, and no conscientious observer need fear to record what he or she sees, for there is no such thing as authority in science, and the veriest beginner may often put the expert to the blush. CHAPTER II ‘The locomotion of birds—Hopping and walking—Reasons for adoption of these gaitt—Why Waterfowl waddle—Swimming and diving—Perching and climbing—Different methods of performing these actions—Specialized birds which have taken to different habits, as Ground-Parrots and Land-Geese— Flight and its varieties—Characteristic methods according to group and size—Sailing and soaring flight—Speed, So old an author as Pliny gives some remarks on the locomotion of birds, many of them quite accurate, as when he points out that Crows walk and Spar- rows and Blackbirds hop. Such differences in action are well known to most people, but it is just as well to have them summarized. The usual gait of birds is a walk, that is to say, when they are considered by groups; it is true the majority of small birds one sees are hoppers, but that is because the common small birds of most parts of the world are passerines, and in this group hopping is the usual gait, walking being customary only in some of the larger species, such as Crows, and in groups which, like Crows, habitually seek food or even live on the ground, such as Wagtails, 13 14 | BIRD BEHAVIOUR Pipits, Larks, and Starlings. As passerine birds are all primarily adapted for a life in trees, even the Larks still having a typical percher’s foot, and as jumping from bough to bough is a natural and habitual movement, it seems natural that this should be continued in all except those most thoroughly adapted to a ground life. The same reasoning applies to the Hornbills, among which family are to be found the only large birds which hop; there are two species of this usually very short-legged and highly arboreal family which have legs of the ordinary length and live mostly on the ground, the Ground-Hornbills (Bu- corax), and these move their legs alternately in the ordinary walking fashion and are even able to run well, which some walking birds do not do— most Herons and Storks, for instance. In the case of these Hornbills, it is to be noted that the hind toe is just as well developed as in the perching kinds, and that they walk on the end joints of the toes, the ball of the foot being raised above the ground, so that one could put a marble under it. This would be unique among birds, which usually tread on the whole under-surface of the toes, where these are on the same level—z.e. the hind toe not set on higher—were it not for the case of the Ostrich, which lifts the basal joints of its two toes off the ground even more, so that its foot can fairly be said to have a pastern-joint, like that of the hoofed beasts with which it habitually grazes. In the Ostrich reduction of the toes is carried to an HOPPERS AND WALKERS 15 extreme, but in most running birds the hind toe is absent or greatly reduced, and useless, so that the case of the Ground-Hornbills, Larks, Desert- Choughs (Podoces), and other running members of perching groups is unique, as they alone of all running creatures have the bearing-surface of the foot well developed behind as well as in front. Unfortunately for our explanation, the Hornbills and passerines do not exhaust the list of groups of birds in which some members run and others hop ; and in the other cases it is difficult to assign a reason for the difference of gait. Pigeons, except some _ (not all) of the most terrestrial kinds, are all short- legged, and most live largely in trees, but they nearly all walk, although some of the most arboreal Fruit-Pigeons do hop as well; 1 have seen this most in the Lilac-crowned Fruit-Pigeon (Ptilopus coronulatus). Parrots, again, are mostly tree-birds, and all short-legged, some very much so, but they generally walk, although the Lories form an excep- tion by hopping. Kingfishers do not move on their feet at all if they can help it, and all without exception are very short on the leg; yet the great Australian Laughing Jackass, which is more of a ground-feeder than any other, is a hopper, while the few others I have been able to study all walk, or rather waddle. So do Bee-eaters, at least the Australian and European species (Merops ornatus and M. apiaster); but of two Indian kinds of Nightjars I have seen one walk and the other hop, and the only Trogon (Prionotelus temnurus) whose y 16 BIRD BEHAVIOUR gait I have ever studied, hopped; and all these birds are short-legged. The shortest-legged Passerines, too, are the Swallows, but these walk when on the ground instead of hopping. Among Cuckoos and Rollers, the practice is more rational, so to speak, for the short-legged species hop, while the longer-- legged Ground-Rollers and the magpie-like Bush- Cuckoos, like the Indian Crow-Pheasant (Centropus sinensis), run. 'Toucans, Barbets, and Woodpeckers all seem to hop, and this about exhausts the list of hopping birds, all of which, it will be noticed, are essentially perchers, so that hopping undoubtedly has something to do with the perching habit. Walking-birds, however, may hop when in a hurry, as one may see with Rooks, Starlings, and even Wood-Pigeons, while birds of prey, which normally walk, though but little, hop so readily when ** cornered”? by a broken wing as to have given rise to the notion that hopping is their natural gait. Conversely hopping birds of the Thrush tribe often take a run for a few feet. Waterfowl have a bad name for clumsiness in walking, and certainly some of the more specialized kinds waddle awkwardly on account of the wide distance between their legs, which is convenient for swimming, but necessarily produces a rolling gait. This also badly handicaps them in perching, which so many of them do, especi- ally in hot climates, for they find it dificult to walk along asmall bough ; and in the case of the perching ~ Ducks, the dwarfed hind-toe is of no use for a grip, so much so that I have seen such active species as PERCHERS AND CLIMBERS 17 the Mandarin Duck and Andaman Teal (Nettium albigulare) slide right over and off a perch on which they had tried to alight. Only Cormorants and Darters among waterfowl seem at all at home in trees, and these have a powerful gripping foot with well-developed hind-toe, and more freedom in the legs than is usual in diving birds. In travelling along a perch, the most active, as” well as the clumsiest perchers, are apt. to move sideways; thus the lively Sparrow and the heavy Cormorant both sidle on a bough, though the ground-living Fowl and the arboreal Parrot walk foot over foot, for which the in-turned feet of the latter are particularly suitable. ‘The most active birds at this pole-walking are the Guans and the Touracous, which run along boughs like squirrels, and at the same time can leap long distances from one perch to another; but on the whole, the more active the bird, the more apt it is to adopt the sidelong gait on a bough, often turning round with each hop, a method of procedure which seems calculated to make it giddy. In climbing, several methods are employed ; Parrots, as every one has seen, hook themselves along with their beaks as well as their claws, though they do not do this in the wild state as much as one would think from seeing them caged; and Cross- bills, those Parrot-like Finches, climb in the same way. Woodpeckers and typical Creepers, however, climb quite differently from Parrots, but like each other, though the last group are Passerines and not 2 18 BIRD BEHAVIOUR related to the former; both hop upwards or side- ways on boughs and trunks, resting on their stiff- pointed tails, and letting themselves slip back if, . which is seldom the case, they want to descend. The Nuthatch, which is not stiff-tailed, has the advantage of these extreme specialists in being able to climb in any direction, down as well as up. Swimming is generally performed by alternate strokes of the feet when the bird is on the sur- face, and simultaneous strokes when it dives; but Auks, though they swim like other birds on the surface, propel themselves when below with their half-closed wings, and the Penguins never use their feet in the water at all, apparently, but rely entirely, both on and under the surface, on their flipper-like wings. Land-birds can gener- ally swim if they are put to it, those which run swimming with their legs—I have seen a young Peacock thus save himself; those which rely on their wings will flap themselves ashore, which I have seen a Swallow do after it had fallenin; but they soon become draggled and exhausted, and except for the large flightless runners, cannot go any distance, in spite of being unable to sink. The giant runners, however, are as strong swimmers as beasts. I have known of a Cassowary making land after a four miles’ swim in a by no means calm sea. Land-birds when swimming sink low in the water, but, curiously enough, so do some of the most — specialized divers ; the Cormorants swim with the tail awash, and the allied Darters only show the LAND GEESE AND GROUND-PARROTS 19 head and long neck above water, most amply justifying the name of Snake-bird given to the Indian species. _ It is curious to note how one finds some swimming birds completely deserting the water, and taking to a land life, though still retaining nearly complete webs to the feet; for instance, the Australian | Cereopsis Goose (Cereopsis nove-hollandie) seems never to go into water except to wash, or to escape when wounded, and the Hawaiian Goose (Nesochen sandvicensis), which lives on the old lava-flows in the mountains of its native islands, exists, during most of the year at any rate, without any water at all, even for drinking, getting the needful moisture from its food of berries and succulent herbs like sow-thistle. Conversely, we have, in the Dippers or Water-Ousels, ‘Thrushes with ordinary perching feet which swim and dive. So also one may find the Parrots, so peculiarly adapted for a life in trees, keeping not only to ground life like Partridges in the case of the Aus- tralian Ground-Parrakeet (Pezoporus formosus) and Night-Parrakeet (Geopsittacus occidentalis), but even waxing fat and losing the power of flight, in the case of the New Zealand Kakapo or Owl-Parrot (Stringops habroptilus), which looks like a gigantic degenerate form of the last. And among Cuckoos, birds also specialized mostly for tree-life, we have theswiftest runner of allbirds in the American Road- runner or Chaparral-cock (Geococcyx mexicanus), which is only about the size of a Magpie, and yet a 20 BIRD BEHAVIOUR can run for hundreds of yards ahead of a horse or dog, being thus proportionately swifter than the Ostrich. It is curious, by the way, that no hopping bird attains high speed or power of long-distance travelling on foot, although, judging from what Kangaroos and Jerboas can do in this way, one certainly would have expected this to happen. In the flight of birds there is of course less possible variation than in their movements on land and trees, or in water, but still there are some very characteristic differences. What may be called the normal or usual flight is by continuous strokes, as is usual in Pigeons, and universal in the Duck tribe; but this progression may be interrupted either by sailing intervals, both by slow-flapping birds like the Gannet, or quick-whirring ones like the Partridge; or by closing the wings and so dropping, to rise again with a fresh flutter, which is the usual method in Passerine birds, Wood- peckers, and Barbets, all tree-birds or relatives of such, be it noted, and most of them small, so that the method is probably adopted to gain impetus: just as many birds, such as Ducks and Parrots, roll much in their flight, apparently to put a “ screw” on to themselves and increase pace. In the Hoopoe the flap and closure of the wings alternate so quickly that the bird looks just like a big butterfly. The resemblance of many Parrots to wildfowl in their flight is indeed curious; both groups stretch out their necks in front and their feet behind, although this backward extension of the feet was SOARERS AND SAILERS 21 supposed to be a speciality of the long-legged waders, the extended limbs acting as a rudder. But as a matter of fact the extension of the legs behind in flight is normal among birds generally, the only groups that draw up their legs to the breast being Passerines, Woodpeckers, Barbets, and Hoopoes, all undulating flyers. The extension of the neck is also normal in many groups, but Passerines, Hoopoes, Rollers, birds of / prey, Herons, Pelicans, Frigate-Birds, Petrels, Gulls, Shore-Birds, and the Carrion-Storks (Leptoptilus) draw it in, so that here there is more latitude allowed, so to speak. ‘The finest flyers of all seem generally to favour the drawn-in neck, at any rate that is the pose with Eagles, Vultures, and Alba- trosses, whose powers of maintaining flight for long periods together without movement of the wings have always evoked admiration, and still remain unexplained. Albatrosses have narrow though very long wings, and usually fly low; the overland soarers have shorter but very broad wings, and only sail when flying high. Both groups, however, are _ noticeably large birds; small birds of any groups, no matter how well-winged, never soar or sail very far. This may be due to the need for weight to give steadiness, but it is at least quite as likely that It is connected with the more lively disposition of small species, and with their habit and need of picking up their food in small bits at frequent intervals, so that they never have either the time or inclination for soaring. 22 BIRD BEHAVIOUR In respect of the activities of the soaring birds of prey, it has been noted that the highest soarers are the latest to rise, the Vultures not taking the sky till after the Kites, and none soaring till the sun is well up, and it has been suggested that sun-lit air has some favourable influence on soaring. Even over here I have observed that a fine, sunny day in winter or early spring will set the Black-headed Gulls on the Thames soaring, but I always put this down to their being inspired by the fine weather with thoughts of their home breeding-grounds, and a preparation for travelling thither; while I should have said that the connection between sun and soaring in the East was simply that the larger carrion-feeders needed clearer air, and had to mount higher, as their food was harder to find; but after an absence of a dozen years from India I am quite willing to admit I may be mistaken. However, sunny weather in autumn does not seem to take the Gulls aloft, as I have had an oppor- tunity of observing recently. It is noticeable that soaring birds are never still,. but keep on describing circles as they float on extended motionless wings; as a matter of fact they appear to descend a little and then use the impetus thus gained to rise again, so that they are really making spirals. A bird, except in a strong wind, can only stand still in the air by constant and rapid wing-action ; this is the feat of hovering, of which the Kestrel is the most familiar exponent in this country during most of the year, though the FLIGHT OF HUMMING-BIRDS 23 Sparrow frequently practises the trick over long grass in summer in order to locate insect prey. _ The Kingfisher also frequently hovers, when a handy perch to swoop from is not available, and in India the Pied Kingfisher is the most familiar of hovering birds, this species seeming always to make its survey of the fishing-ground on the wing. Hoverers of the more skilled types raise and lower themselves with great ease and skill, such flying reaching its perfection in the Humming-birds, - which almost invariably hover when feeding, and dart sideways or even backwards as unconcernedly as dragon-flies. ‘They seem indeed to represent these insects in the bird world, for like them they are no pedestrians, only using their feet for perching or clinging, since if any bird is unable to progress on the ground it would appear to be these, and they seldom shift their position even when perched. In conformity with their insect-like flight, the wings of the Humming-birds are much like those of insects in shape, the segments of the arm between the pinion and the body being much reduced, so that there is little action except from the shoulder. Not all of them, however, move their wings with the insect-like quickness which in the small kinds results in the hum that gives these truly fairy creatures their name, for the largest species (Pata- gona gigas), which is as big as a Swift, flaps its wings at an ordinary rate of speed and quite visibly. ‘The slowing of the wing-stroke in accordance with increase of size seems to be a general rule in birds, AY Ce i en ee 24 BIRD BEHAVIOUR always supposing those of the same family are compared; thus the common Grey Heron flaps in a very leisurely way, while the little Dwarf Bitterns (4rdetta) use a quick fluttering stroke like a Moorhen, and the slow heavy sweeps of the Goose contrast forcibly with the quick wing-beats of the Duck. Comparing a Duck and a Heron of about the same size, however, the Duck will be found to move its wings more quickly, the Ducks being a quick-action family as a whole, and the Herons a ‘slow one. This makes the comparatively quick action of the small Herons interesting, as the wings in all this family are large for the weight of the very light body, so that we must not suppose that quick wing-action is always connected with small wing- area, though this is often the case, as in such birds as Auks, where the wing has been reduced, to serve also as an oar, to the minimum size consistent with flight. The Great Auk went further—and _ fared worse, for when man came upon the scene some time in the Stone Age, it began to discover the disadvantages of turning its pinions completely into paddles. The great soaring and sailing birds also find they “‘cannot have it both ways”; they are adepts at saving their petrol, so to speak, and this is a point which aviators would do well to study, as it would be of great advantage if they could circle by the - hour without using their engines; but they are bad and heavy starters, rising at a low angle and DEATH-TRAPS FOR PIRATES 25 with great effort. This is particularly the case with the Albatrosses, which have sacrificed muscular power to gliding capacity, and elongated and nar- rowed their wings, to a very risky extent. On the Australian coast there is a valley ending in a cliff-wall which is a regular death-trap for the local Albatrosses which pass over it on their way home to a breeding-ground. If, when coasting over this hollow, they dip between the walls, they lose the wind, begin to drop, and not having suffi- cient strength of wing-beat to “‘get up steam ” in the limited space in front of them, end by colliding with the cliff at the end of the gully, when they fall to the ground to die a lingering death from hunger, for the walls of the valley are too steep for them to climb, and they have not enough intelligence and enterprise to explore a cave at the cliff-foot which would lead them out into the open again. Another example of the dangers of over-develop- ment of wings is to be found in the appropriate fate of hanging that now and then befalls the piratical Frigate-bird in the West Indies, as described by Dr. P. Lowe; this species, like so many tropical waterfowl, frequents trees, but may easily miss its footing when alighting and slip down among the twigs, where its great wings cannot have full play, and it is exceedingly likely to catch its neck in a fork, when its very much reduced feet are of little use in its attempts to extricate itself, and it soon perishes. 26 BIRD BEHAVIOUR The Frigate-bird is, however, a better starter than the Albatross, being able to ‘‘ take off” at once. The easiest of all starters are the Gulls, for they can spring up from a sitting position if they like, without troubling to rise to their feet. When Swifts start off the ground, they seem to “‘ take off ’’ with their wings, like Bats when simi- larly situated; the idea that they cannot thus rise is certainly erroneous so far as the common House-Swift of India (Cypselus affinis) is concerned, as I have proved by repeated experiments. With regard to the power of springing up vertically at the start, the Game-birds are unrivalled, on account of their muscular power both in legs and wings. The best settlers seem to be the Hawks; it is delightful to observe one of these birds just glide up to a perch and touch it at exactly the right moment, no final flapping being required; such accuracy of action being no doubt a necessary accomplishment in birds which have to grasp food when in flight and avoid injuring themselves by concussion in so doing. But such skill has to be acquired with practice; I have seen a young Kite in India plunge up to its belly in a pond when picking up an object which an old one would have skimmed off with hardly a ripple. As a contrast to the skill of the Hawks, we may take the awkwardness of the Grebes, which trail their legs even when alighting and strike the water anyhow. I am sorry I never noted what, if any, difference there is between young and old Kites in the matter * steam QUADRUPEDAL LOCOMOTION 27 of soaring ability; but Buller, in his ‘ Birds of New Zealand,” mentions that the immature speci- mens of the very common Harrier of that country (Circus gouldt), which are more conspicuously differ- ent in colour from the adults than are the young Indian Kites, do not soar as the old ones do, so that they are often taken for a different species of Hawk altogether. In very rare instances young Std may even fly better than adults; this is the case, according to Mr. W. H. iain, with the common Tinamous of Argentina; and in that very curious bird the great grey Steamer-Duck of the coasts of southern South America (Micropterus cinereus), only the younger individuals seem to be able to fly at all, the older birds becoming so heavy that their small wings simply serve to support and assist them when running on the surface of the water, a curious quadrupedal mode of locomotion which has attracted the attention of all observers, but seems only to have been fully and exactly described by Mr. M. Nicoll in his admirable work on his experiences as a naturalist in the cruises of the Earl of Crawford’s yacht the Valhalla. So fast can these huge Ducks ”? along, he tells us, that a six-oared boat cannot overtake them or even come within shot. Quadrupedal locomotion on land is found in the case of the Penguins, which when pressed will use their flipper-wings as fore-legs, the species which inhabit snowy regions tobogganing along most effectually in this way. As we shall see later, also, a 28 BIRD BEHAVIOUR some young birds, even among those of our own country, employ quadrupedal locomotion. With regard to the speed of birds in flight, some very “tall” statements, especially of German manufacture, have been circulated’; for there is a strong tendency to exaggeration about this point. Before steam-engines came in, the speed of birds’ flight could not be so well estimated as it can now; as Newton ~justly remarks in his famous *¢ Dictionary of Birds,” the Swallow does not usually travel so fast as an ordinary express train; and yet this bird is proverbial for swiftness. ‘Tvhe speed of the common Pigeon is also well known owing to the popularity of Pigeon-races, and these show that it is a good Pigeon that can do its fifty miles an hour; while the most ordinary observation shows that the Pigeon, though not nearly equal in swiftness to the Swallow, is yet much faster than the majority of birds. The speed of small birds tends to be exaggerated, owing no doubt to the quickness with which they move their wings; thus, Common Teal are credited with being the fastest of Ducks by some writers, but this can hardly be the case, for in India the Shoveller, and even the heavy Spotted-billed Duck (Anas pacilorhyncha)—the Mallard of India—haye been recorded as leading a bunch of Teal; and in America a flock of the very closely allied Green- winged Teal (Nettiwm carolinense) have been seen _ so hard pressed by the apparently slow-flying White-headed Eagle that they had in desperation RECORD PACE-MAKERS 29 to drop into the water headlong, a common man- ceuvre with Ducks when a pursuer’s speed is too much for them. | The. slow-flapping flight of large birds as com-: pared with their more briskly moving relatives in the same family has long been recognized by sports- men as very deceptive; wild Swans, Capercailzie, and wild Peafowl are all birds which need the shot to be aimed well forward if they are to be fatally hit, their flight being so very much faster than it looks, especially to a shooter who has been used tosmaller fry. The fastest birds of all appear to be, as one would expect, some of the Swifts, the palm among these being assigned by Blanford, in the “ Fauna of British India,” to the larger species of Spine-tails (Chetura), which are stated by observers to whizz . by with a twang like a bowstring. It is noticeable that the spiny-tipped tail in these birds, which, like the similarly armed tail of most Woodpeckers and Creepers, serves as a support when the owner is clinging perpendicularly, is so short that it cannot be of much use in directing their flight, and in fact the Swifts generally, though better flyers than Swallows, distinctly tend to be shorter in the tail, and often dispense with the fork. In fact, the opposite development of the tail in birds which fly well is very curious, some fine flyers having a long forked tail, like Swallows, Terns, and Frigate-birds, while others, like the above- mentioned Swifts, most Albatrosses and Vultures, 30 BIRD BEHAVIOUR and that aerial acrobat the Bateleur Eagle (Helo- tarsus ecaudatus) seem to have gone in for tail- reduction, so that the steerage, etc., is evidently given over entirely to the wings in their case. The steering action of the tail is particularly observable in Kites, in which that member is often turned almost into a vertical plane, and this charac- teristic action was noted by the ancient Romans, Pliny suggesting that it was the Kite that taught men the use of a rudder to a ship. Generally speaking, however, the most important use of the tail is as a brake when descending ; why it is always expanded at starting is not so obvious, and probably the action is an involuntary one, like the dropping of the legs by Gulls and Crows when they check in their flight, a habit which has led some observers into the mistaken idea that Crows, when picking food off water, do so with their feet, which is never the case so far as I have observed. | Mere speed of flight, by the way, 1s not neces- sarily so indispensable an asset for escaping aerial . enemies as may be supposed; Swallows and Swiits certainly suffer little from birds of prey, the Hobby being the only Falcon which ordinarily catches them, and the swift Sand-Grouse, among ground- birds, are too much for most Falcons. But some quite slow birds are also very difficult subjects for Hawks, owing to the facility with which they © shift from the stroke, the Hoopoe and Lapwing being notorious for their abilities in this respect ; TERNS AND TROPIC-BIRDS 31 while as to the slow-flying Grass-Owl of the East (Strix candida), a near relative of the Barn-Owl, Indian falconers say it is one of the birds which “ will show you the stars,” in allusion to its habit of “ringing up” and thus escaping the pursuit of their Falcons. The flight of various birds, indeed, admirably bears, out the old “‘ horsy”’ proverb, “* They run in all shapes”?; one often cannot at all predict what a bird’s flight will be like from looking at a dead or caged specimen. ‘Terns, for instance, are so Swallow-like in build that they are often and quite reasonably called sea-swallows, but their flight is not at all Swallow-like, though recognizably like that of their family relatives, the Gulls. ‘Tropic- birds (Phaethon) look very like ‘Terns, and feed in the same way, but their flight is not at all like that of a Tern, but is performed with quick wing- beats, like that of a Duck. It thus differs much from that of all other long- winged sea-fowl, but much resembles that of the swift-flying Ring-necked Parrakeets (Palagornis) ; and it is curious that the Tropic-bird has the long pointed tail one usually associates with a Parrakeet. Generally this wedge-shaped tail is favoured more by ground-birds like the Pheasant than by fine flyers, but besides the Tropic-birds, the Skuas also possess it, and they are experts, being able in the course of their piratical profession to fly down the Terns, which have the forked tail usually associated with dexterous flight, and very seldom found in 32 BIRD BEHAVIOUR ground-birds, the Blackcock being the best-known exception. Short-winged birds may display a quite unexpected * power of flight; thus the Jay flaps along with slow beats like its far longer-winged relative the Crow, can fly fast if it hkes, or swoop in an almost Hawk-like way, and often crosses the North Sea on migration. On the other hand, birds with large long wings may be, in rare cases, very poor flyers, as in the case of the Secretary-bird of Africa, this strange pedestrian Eagle having so neglected its wings that its flight, although of Eagle-like stateliness, is very weak, and the bird can even be run down by greyhounds, just as the short-winged heavy Wild Turkey 1 is. There are stories of Great B uaesiece being coursed _ by greyhounds, and Xenophon says positively that in the historic retreat of the Ten Thousand the Greeks rode them down, “‘ for they fly only a short distance like Partridges, and soon give in.” It seems to me quite possible that this Bustard was in former times on the way to degenerating into the state of the Steamer-Duck above mentioned, and that increasing persecution by man has simply eliminated degenerate individuals,-as the bird is now a strong flyer and goes long distances. CHAPTER III The nutrition of birds—Various kinds of food, animal and vege- table—Methods of and adaptations for obtaining it—Changes of diet—Gluttony of some species—Power of discrimination among foods, both vegetable and animal—The much-discussed relations of birds to insects, especially butterflies. *“* Worms and flies,’ mentioned by Shakespeare in Macbeth as the food of birds, are certainly the staple of the large majority of the class, at any rate if we take both terms in the wide old-fashioned sense, in which a worm meant anything long- shaped, and a fly almost any flying insect; for on small invertebrate life birds mostly depend, and even when the old birds are mainly or largely vege- tarian, the young feed, or are fed by their parents, on animal food in perhaps the majority of cases. This diet is probably ancestral, for it is at least probable that the reptilian ancestors of birds were largely if not mainly animal-feeders, and thus the young only go back, as in so many cases in nature, to the early diet of the race. But just as even among the reptiles there are some mainly vegetarian kinds, such as some iguanas, the land-tortoises, 3 33 Bd BIRD BEHAVIOUR and some of the terrapins and turtles, so there are certain families of birds, and sub-groups of other families, which are mainly vegetarian in diet, as implied above. Some of these groups are large or important, and therefore well-known, such as Parrots, Pigeons, Game-birds, Finches, Cranes, and Geese; among small and less familiar groups of vegetable-eating proclivities are Ostriches and all the other giant flightless birds—Emus, Cassowaries, and Rheas, their relatives the Tinamous (the ** Partridges ”? of South America), the Seed-Snipes (Lhinocorythide), the Sand-Grouse, the Screamers (Palamedeidg@), and among the less familiar perchers the Touracous or Plantain-eaters (Musophagide), the Colies or Mouse-birds (Coliide), and the nectar-sucking Humming-birds. Many if not all of these take more or less insect or other animal food as well; there seems to be no group of any size so purely addicted to vegetable food as certain of the animal-feeding families or groups are to an animal diet. Such pure animal feeders are especially to be found among those wnich take larger prey than insects, especially the 1ish-eaters ; Gannets, Cormorants, Pelicans, and the Frigate- and Tropic-birds seem to be purely animal- feeders, though the Gulls, and even the oceanic Petrels, take some vegetable food. The “‘ birds of prey,” as one would expect, are generally purely carnivorous or insectivorous, though some Vultures will eat fruit; the South-American Vultures feed on palm-fruits, and the Egyptian © ODDITIES IN DIET 35. Vulture will devour not only spoilt figs, as recorded by Tristram, but even despoil date-trees of their crop. So also among birds generally regarded as purely insectivorous, Swallows in North America are known to feed on the berry of the Wax-Myrtle (Myrica cerifera) in autumn, and among the worm- eating waders the Ruff and the Black-tailed Godwit eagerly devour rice and other grain, such as wheat and millet. The Game-birds would perhaps be better regarded as omnivorous, like the Rails, and most fruit-eaters, like ‘Toucans and Hornbills, eat small animals freely when they can catch them. The Barbets, which seem to be the unspecialized ancestors of the Toucans—if these really are a distinct family at all—show a curious contrast in habit according to their distribution, though all much alike in structure; the Asiatic species are mostly fruit- eaters, while the African and South American species are largely insectivorous. With the Trogons, which have an equally wide distribution and are still more alike structurally, matters are almost exactly the other way about; the old-world species, chiefly to be found in Asia, though one or two are African, being insectivorous, while the American kinds live mainly on berries, which they gather on the wing. One interesting point comes out from this con- sideration of bird-diet, and that is, that the largest birds, and those which, as groups, display the finest plumage, are more or less vegetarian, while those whose power of flight is pre-eminent range them- 36 BIRD BEHAVIOUR selves in the animal-feeding section; though it must be remembered also that a vast number of insectivorous or mixed feeders have weak powers of flight and very sedentary habits, such as the host of small insectivorous birds resident permanently in the tropics. The majority of birds show little or no specializa- tion for the purpose of food-getting; that is to say, one very generally cannot tell from the look of a bird whether it lives mainly on animal or vegetable food. For instance, Pigeons, as has been said above, are mainly vegetarian, and Plovers are chiefly worm- and insect-eaters; yet the bills of the two groups are singularly alike, and the vege- table-eating Cranes are so like the animal-feeding Storks and Herons that people who are not used to birds constantly confuse them with each other. Similarly, it is curious that the Parrots, some of the strictest vegetarians, have bills more like those of the very carnivorous Hawks and Owls than like those of any other birds; and when it comes to the hosts of passerine birds with the ordinary unspecialized type of beak, observation alone can tell what their diet is. There are, however, plenty of well-known and conspicuous cases where structure and habit go closely together ; to take a very familiar case, it is easy to see that the thick, short conical bill of a Finch is correlated with the habit of cracking seed- husks, and the long pouch-bearing bill of a Pelican is obviously especially adapted for catching fish. “ATWO SUTVIIS ‘yj9} AuLoy yyM ‘morsreU JO} J[GeMs ‘T]Iq Jo 9d4} YOnp Jo WoTyeoyIpour ous1;xXy suleq sMel oy} “YS BSUIyD}eo 1OF poytpomt [Iq yo adA4y yon . “AaTTIBAOHS “UUSNVOUAN *pOOM SUT}INS TOF [Iq JO wAIO0F OyI]-JastyO SsuIMOYS “‘SUIpeeIq 19}Je psys “yseur Auloy e 0} ONp SI [[Iq Jo azIs aany sy, “AHMOATGOOM MOVIA LVAUD “NIAANd y FLAMINGOES. The species here represented is the Common Flamingo, the only one found in Europe; it may generally be seen in the Bitter Lakes, by the Suez Canal. [By permission of the artist, Sir Harry Johnston, G.C.M.G. NETTING AND SIFTING 37 Few people, by the way, realize how a Pelican’s bill works ; it is not a fish-creel, but a dip-net; when the bird is fishing, the elastic branches of the lower jaw expand into a great skin-floored spoon, and scoop up the prey, contracting again when this is captured. The beautiful sifting-arrangement of rows of horny plates along the bills of the typical Ducks is one that can easily be seen in action, and it serves for collecting not only animal but vegetable food from water or mud; in the grazing Geese and the fishing Mergansers the ridges take the form of teeth, since here biting rather than sifting is needed. The perfection of the sifting apparatus is, as Dar- win pointed out, found in the bill of the Shoveller Duck, where the ridges almost equal in propor- tionate length the whalebone of some of the whales ; and the Shoveller seems consequently to be able to extract nutriment from water in which the other Ducks find ‘‘ bibbling ”’ unprofitable. The simplest form of the ridge-row is to be found, as might be expected, in the Magpie-Goose above noted, in which it is hardly more pronounced than the “ burring,”’ like that of the ends of a pair of forceps, to be found in the beak of the Emu. Nevertheless the Magpie-Goose ‘‘ bibbles”’ like a Duck, and does so habitually, unlike the true graz- ing Geese, though these will use their grazing bills in this way occasionally; recently, in autumn, I saw no less than four species of Geese, the Common, Chinese, Canadian, and Bernicle, sifting in this 38 BIRD BEHAVIOUR manner the water in the roadside gutters, filled with dead leaves, on a wet afternoon in Hyde Park. The Magpie-Goose, however, also grazes at times, but is particularly fond of digging and tearing with ‘its bill at mud and roots, though I have so far not been able quite to make out what it gets when thus engaged. It will be noticed that the Common Duck, with its specialized bill, keeps up the varied methods of feeding noted in this primitive-looking relative, though the Shoveller has practically become a sifter pure and simple. The diving Ducks, al- though having a sifting beak, seem to use it very little, for when one watches them feeding in clear water they seem to simply pick up their food from the bottom, darting hither and thither, and not working away in the same place. Small portions they can swallow below the surface, but have to come up with a large mouthful, such as a water- snail. Such molluscs form a large proportion of the food of Ducks and other water-birds, and land-shells, as all know, are eaten by land-birds, though generally these are small specimens which are eaten whole, the Song-Thrush being exceptional in its habit of dashing large specimens on stones in order to chip off their shells and prepare them for food. There are several other kinds of specialized mollusc-eaters, notably the shell-eating Storks of the genus Anastomus, called ‘‘ Open-bills’’ from the fact that their beaks gape in the middle in DUCKS AND FLAMINGOES 39 adults; of these there is a black African species and a pied Asiatic one. ‘These birds have a fringe of horny growths towards the tip of the beak, at any rate in adults (for they are absent in the young of the Asiatic kind) ; and this renders the peculiarity of the sifting structure of the Duck’s bill being repeated in the Flamingoes of less value as an evidence of affinity. Indeed, although many of the less-informed naturalists seem to regard the Flamingoes as simply Roman-nosed Ducks on stilts, anatomists find them to be more closely related to the Storks ; and their bibbling performances, though similar in principle to those of the Ducks, are carried on witha curious difference in detail. In the Ducks the bill has the upper jaw far the larger, the lower fitting within it; in the Flamingoes the bill is constructed in just the opposite way—the lower jaw being so much deeper than the upper that the latter simply is to it as the lid' of a box, or in some species shuts within its edges. Being also very freely moveable, it plays like the lower jaw of the Duck, and acts as such, for the Flamingo feeds with its bill upside down, as many must have observed at zoological gardens where these most interesting birds are kept. Judging from their behaviour there, they can extract food from water which affords nothing to the Ducks—except perhaps Shovellers—and this, added to their habit of frequenting salt-lakes, avoided by most other birds, is no doubt a great asset in the struggle for existence to these unprolific 40 BIRD BEHAVIOUR and very helpless creatures. Like Ducks, they eat both animal and vegetable food, and in captivity eat and thrive on such an unnatural diet as grain. In both Ducks and Flamingoes the sifting apparatus is found along the edges of both jaws, but in some of the Petrels there is found a similar structure for extracting food suspended in water which still more recalls that of the whalebone whales, in which the so-called ‘‘ bone ”’ (which is really horn) is confined to the upper jaw, by being similarly limited to the upper bill. These Petrels, called Whale-birds by sailors, belong to the genus Prion of naturalists; they are small birds about as big as Doves, of a pigeon-blue colour, and display a beautiful gradation from a bill which is quite ordinary except for the ridges visible in it when opened to one which is so bulged out at the sides, and has such long fringes, that the caricature of a whale’s head is at once obvious. Yet the species are so closely related that it is quite difficult to separate them, so that here is evidently a case where evolution is comparatively recent and has not resulted in any decided differentiation. To return to the subject of mollusc-eating birds, from which we have been led by the consideration of these fringed-billed birds, whose “‘ dentition,”’ if we may use the expression, is just as worthy of study as the true teeth of beasts or reptiles; we find in the Oyster-Catchers (Hematopus) which, some pied like our own, and some black, haunt sea-coasts nearly everywhere, a special weapon for getting to EXPERIMENTAL BORINGS Jak terms with shellfish in a very hard, chisel-tipped. bill, strikingly different from the soft weak bills of the majority of the Snipe family (Charadriudez) to which they so obviously belong by the rest of their structure. With this they can prise limpets off the rocks, and adroitly chisel out the meat of other shellfish, while at the same time the tool is an efficient weapon as well, like the axe in the hands of early man, and nest-robbing Gulls and Crows find the Oyster-Catcher’s home a difficult proposi- tion to tackle. The most typical bills in the Snipe family have a beautiful adaptation to the ‘‘ Diet of Worms” ; in the Woodcock and other typical Snipes the bill is “‘ overshot,”’ that is to say, the upper jaw dis- tinctly exceeds the lower in length, and has a knobbed tip somewhat like the end of a crochet- hook, behind which the lower jaw fits accurately, so that the bill can be driven into the mud or soft ground with ease. At the same time the bill is so soft and sensitive that when the bird has been dead a little time the end is seen to be pitted like a thimble by the shrinkage of the covering skin owing to the drying of the soft nerve-tissue within, and the upper jaw is so flexible that the bill will open at the tip and remain closed for the rest of its length. ‘Thus it can grip a worm when felt without the necessity of being opened entirely, which would be a difficult matter for a bird of this size; the worm when seized is, so to speak, nibbled up, not dropped down the throat with a jerk of the uplifted 42 BIRD BEHAVIOUR head, as is so often seen to be done in the feeding of long-billed birds. At the same time, so that the bird can keep a look about it when its bill is driven into the soil, the eyes are situated far back in the head, reminding one of the similar shifting back of the eyes in the most highly developed grazing beasts, such as harses and cattle, though here the necessity for deep-rooting molars is given as the reason. : Structure and function correspond very closely in the Snipe group; for instance, the Common Snipe (Scolopax gallinago) and its East Asiatic ally the Pintail Snipe (S. stenura), which are exceedingly alike in size and plumage—the curious narrow feathers in the tail of the latter not being noticeable till looked for—can be quite easily separated by the difference in the bill, expanded at the tip in the common species, and of uniform calibre in the Pintail; and their habits correspond, the Common Snipe being mainly a mud-feeder and worm- catcher, while the other often feeds on dry ground and has a more varied menu, including land-insects and land-shells to a great extent. Through the Sandpipers of different sorts a gradation can be traced from these specialized bills to the short pigeon-like ones of the Plovers, with their normally placed eyes. Yet these are also worm-eaters and borers to some extent, so that here, as in the case of the Duck tribe, we can trace the evolution of structure and habit most satisfactorily. Two or three interesting little off-shoots of this THE TURNSTONE AT ITS TRADE 43 family of mudlarks need noticing. The Turnstone (Strepsilas interpres), well known on all coasts in the winter, is a thick-set little bird with a plain, short, straight, hard beak, in which the only notice- able point is the very straight profile. It is a beak which at first sight seems only suitable for ordinary pecking, and is often used for this, but the bird derives its name from the unusual habit of turning over stones and other objects in search of the creatures which shelter beneaththem. Mr. Barnby Smith has recorded in the Avicultural Magazine his experiences with two captive birds of this species ; these he found could turn over a weight of as much as half a pound, a big feat of strength for a bird not larger than a Song-Thrush, and Edwards, the well-known cobbler-naturalist of Banffshire, saw three combine to try to upset a dead cod-fish which was too heavy for one to manage alone. An opposite case to that of this widely-ranging and versatile bird is found in the extraordinary little Wry-billed Plover of New Zealand (4na- rhynchus frontalis), which is unique among birds in having its bill bent to the right side, an adaptation, it is said, to a habit of searching for food around stones, and always running in one direction; it is well figured, and its peculiarities described in the second edition of Buller’s ‘‘ Birds of New Zealand.” Then, among the very small Sandpipers known as Stints, we get the unique Spoon-billed Stint (Eurynorbynchus pygmeus) of Eastern Asia, a rare 44 BIRD BEHAVIOUR bird with a bill expanded at the tip like a miniature Spoonbill’s, and presumably used in much the same way, 1.¢. for sifting as a Duck does. The true Spoonbills, by the way, are nearly related to the Ibises, and in India our British species, which is well known there, is called Spoon-Ibis (Chamach Buza)—a creditable tribute to the un- taught native’s discrimination in classification ; our European ornithologists have generally put the Spoonbills in a family by themselves, though they are so near the curve-billed Ibises that a Spoonbill- | Ibis hybrid was bred some years ago at the Berlin Zoo. ‘The Curlews, which are so often confused with the Ibises, are simply large Sandpipers with the beak modified into the same bow-shaped form as that of an Ibis. ‘The Curlews, however, simply probe for food, without the lateral sweeping action so noticeable in Ibises. Curved or bowed bills are common among passerine birds, and are often employed in different ways; the use of such a bill as a probe is familiar in our tiny Tree-creeper (Certhia familiaris), which investigates the bark of trees by its aid; but there are also other Creepers with straight bills, and the group grades into the strong-billed Nuthatches, whose beaks are powerful hammers; a Nuthatch hews like a Woodpecker, and splits his nut with a powerful swing of the whole body from the hock, © having first fixed the nut in a crevice to give a purchase and keep it steady. Some of the social Thrush-like Babblers in the PICK-AXES AND PROBES 45 East also have the bow-bill, and no doubt this 1s often used as a probe; but on keeping some speci- mens of the Rusty-cheeked Babbler (Pomatorhinus erythrogenys) in India in a small aviary with a deep bed of sand on the floor which had become hardened, I was astonished to find them vigorously using their long curved beaks as pick-axes, digging up the ground as if a corps of pigmy navvies had worked at it. ‘The beak is evidently adapted for much wear and tear, as I found on buying these birds that in some it was much overgrown from want of use, and had to be cut back. But the most remarkable beak found among insectivorous birds is that of the Huia of New Zealand (Heteralocha acutirostris); not so much from the peculiarity of the bill itself, as because of its different shape and use in the two sexes, a phenomenon unknown elsewhere among vertebrate animals, since, however different the sexes may be in general appearance, their means of obtaining food are practically identical. But in the Huia, although the plumage and size are identical in both sexes, the beaks are as different as those of a Woodpecker and a ‘Tree-creeper, the male having a strong, straight digging bill of moderate length, and the hen a long, curved, slender, probing one, twice as long as her husband’s pick-axe. | The late Sir Walter Buller, in his admirable book on the birds of New Zealand, tells us how he was able to study the actual use of their very diverse bills by these birds. He had a pair brought to f 46 BIRD BEHAVIOUR him by a Maori, and turned them loose into a small room. Here he provided them with decayed logs infested with the boring grubs of a beetle (Prionoplus reticularis), which forms an important part of the Huia’s natural food. The birds were tame, and he could easily watch them at work—the male chiselling and hacking at the rotten wood, and the hen probing the beetle-burrows where this was too hard for him to cut it away. When, after pecking away at the wood, the male Huia still failed to reach his prey, the hen would come and pull it out with her longer forceps, but, although she had availed herself of his preliminary work, she always ate herself everything she thus got; be- haviour apparently selfish, but, as we shall see later, quite normal among hen birds. The two nevertheless were much attached to each other, and this seems the character of the species; there is even in Buller’s book a figure of a hen Huia whose upper bill, by some accident or natural deformity, had grown into the shape of a corkscrew, so that it can hardly have got enough food to support life naturally (although the Huia eats berries as well as insects) and had evidently been fed for a long time by a devoted mate. | In this case the hen evidently has the more speci- alized and recent type of bill, and those of the young of both sexes resemble the male’s; and curiously enough, New Zealand presents us with yet another case of female specialization in the case of the local species of Sheldrake (Casarca variegata) 9% “Iliq Jo adAy “Sp1Iq SUIYSY SuOMe UOIMMOD }sSOMT []Iq FO 9d4} OyI]-1vads 94} SuIMOYS SI} DAVY SoOxKOS YJOq JO Spiiq BunoX ‘adAj Axrvurpszo jo [Iq YIM ‘NOUTH (HIV) VINH “SOOTASTO SUITOIVIS 1OF poydepe []Iq oyl]-JedseI9-s01 J, SUOT ay} Surmoys “Ttquoods 91} OyI] Yon Spooj J200AV 9Y3 ‘JUSIIYIp OS ST IIIq 94} YSnoyITy ‘(@1VNG4) VINH “LOOOAV *TIMO]T OY} uLyy ‘Avid JO piiq & FO TITIq royyems mel 19ddn oy} YM Spiiq MoyFloy} FO 9UO ST OSUTMLI,T SILI, peyjoo} pue poyxooy oy} JO Juomdopaop jsosu0I4s dt} SuTMOYS “OONINV1I4 ‘NOOIVHA ANIWMOAAAd “YSTT AIA JOS} []}q OY} pue “MoToY st [Iq oy} uO ,,UIOY,, OY, “TTIANNYOH SOUMHOONTIHY *19}JCM UL OIJ PUL O}F []Iq $}I SuIdoomsS Aq SpooyJ []Iquoods oy “TTILANOOdS ; : f F : ; ' 3 ; AN ADVANCED DUCK 47 called “‘ Paradise Duck” in that country; in this the plumage is affected, the drake being a dark grey with a greenish-black head, while the duck is mostly chestnut-red with a snow-white one, and is thus far more striking and conspicuous, though not quite so large as her mate. As in the other case, her daughters confirm the pedigree by resembling their more sombre-tinted father in their first plumage, attaining their feminine plumage later on. Readers will be reminded of the similar case in human hair, which is short in babies of both sexes, but afterwards tends to grow longer in women than in men, though the general habit of cutting the men’s hair makes the difference seem artificial. The Huia, which in size and shape is not unlike a Jay, was always a bird of limited range, and never found in the South Island; it is now very local, and it is to be hoped that the State restrictions on the capture of the peculiar birds of New Zealand will be successful in preserving it—without some- thing of the sort it would soon have been exter- minated “‘in the cause of science.” Next to the Huia, the bird which shows most sexual difference in the bill is the Capercailzie, so well known to Scottish sportsmen and a common object in our poulterers’ shops in the winter; and here there is a possible explanation in a different manner of feeding in the two sexes. The cock has a much larger and more hooked bill than the hen, even in proportion to his far greater size; in fact his bill looks more like that of a bird of 48 BIRD BEHAVIOUR prey than a game-bird. Now, the cock tastes far more of turpentine than the hen, and he is known to feed more on pine and fir-shoots, his mate, with her small ordinary game-bird’s beak, seeking her food more upon the ground. This brings us to the consideration of vegetable- feeding birds; but in the case of these there is seldom much modification of the bill, nearly all the sensational beaks, if we may thus express it, belong- ing to animal-feeding birds. ‘There is, however, a very peculiar specialized beak in a bird which, like the Capercailzie, is especially a haunter of coniferous woods, and derives its food from them—the Cross- bill, in other respects a very ordinary member of the group of Finches. In this bird, often a winter visitor here, and one which has of late years bred quite frequently in Britain, the beak is crossed at the tip, both jaws being curved; the jaws may cross either to the right or the left, and this crossing - is quite accidental or indifferent, having nothing to do with sex. The young Crossbill has, up to the time of leaving the nest, the ordinary Finch-beak shutting evenly ; presumably the direction of the crossing depends on the nestling being right- or left-beaked, 1.é. using its beak instinctively more on one side than another. The particuiar use of the bill is to prise open the scales of pine- and fir-cones, the underlying seeds of which form the Crossbill’s favourite food, and are scooped out by the tongue, which is unusually long for a bird of this group. TOUCANS IN EVOLUTION 49 The most striking beaks found among vegetable- feeding birds are of course those of the Toucans and Hornbills, groups which are constantly confused by people unacquainted with birds, and very naturally, since both are so conspicuously over- beaked, so to speak, that the differences between them are quite over-shadowed by their resemblance in the prominent feature, and their general habits are also much alike, both groups being tree-haunters and fruit-eaters, though they take animal food as well. ‘The Hornbills, however, have three toes in front and one behind, the front ones being more or less connected in a common skin, as in Kingfishers, to which they seem to have some affinity; the Toucans have their toes in pairs, like Woodpeckers, with which they are closely connected by the intermediate family of Barbets (Capitonide). In fact a very interesting evolutionary exhibit might be made up by any museum possessing plenty of specimens of all three families, so as to show the gradation from the Woodpeckers into the Wrynecks, the Barbets with their Crow-like or in some cases almost Wryneck-like bills, and the very unbroken series of T’oucans, ranging from forms like the Toucanets (Selenidera), which, in bill and body, hardly exceed the biggest Barbets, of the genus Megalema, to the great black, enormous-billed birds of the genus Rhamphastos, the most typical Toucans of all. In the Hornbills there is no gradation into an- other family altogether, but there is much difference 4 50 BIRD BEHAVIOUR between the small Magpie-sized Hornbills of the genus Tockus, with little or no “ top-story ” to the bill, to the large typical Hornbills, often as big as hen Turkeys, with enormous bills generally crowned with a great horny excrescence. The smaller kinds are more insectivorous than the larger, and thus show some approach to the Wood-Hoopoes (/rrisor), which have much more curved bills than the ordinary Hoopoes, and feed when on trees, while the common Hoopoes are ground-feeders. It has been well suggested that the great bills of the larger Hornbills and Toucans are adapted to giving a purchase for wrenching off tough-stalked fruit; as the birds grew bigger, too, they would not be able to venture on such slender branches, and so would need more to reach out for their food. And if the beak had got merely longer without acquiring bulk, any wrenching effort would have been liable to dislocate it. That Hornbills at any rate work their beaks very hard may be inferred from the facts that in the largest and bulkiest-beaked kinds the edges of the jaws are worn and chipped in elderly specimens, and that if the fruit will not come away by fair means, some Hornbills think nothing of throwing themselves bodily off the bough and wrenching it away by sheer weight. No doubt the effort of recovering their perch in gymnastic exercises like this is what gives these particularly awkward-looking birds the deftness on - the wing which many people must have observed when watching them catch in the air grapes or other SS a ey gpl RHINOCEROS HORNBILLS. Two forms are shown here, the true Buceros rhinoceros, and the straight-horned Buceros sylvestris. 50 “YN O'D ‘uojsuyol hav py Avg Gsuav ayy fo uorssimaad hgq| ‘yeoq pue oseunid S}T JO WOTCIOTOS oY} UT [[IquIOF SOrd0UTYY IY} Soyquaser A[snormos puv ‘SsuRNOY, 94} Jo }S9S1L] OY} SE ODOT, oY, “SNVONOL OSOL ganar ata Tg a HANDICAPPING HELMETS §1 food thrown to them in the aviaries in zoological gardens. | Even the biggest and most specialized Hornbills and ‘Toucans like animal food, though the ‘* horn ” of the former must often baulk them in obtaining prey from crevices and holes; for I once had a narrow escape from a nasty dig in the face from a Concave-casqued Hornbill (Dichoceros bicornis) con- fined in a hutch in the Calcutta Bird Market ; about half the bill passed between the wooden bars, but the broad helmet acted as an efficient ‘‘ stop ” and spoilt the stroke. Buffon was often fanciful in his remarks on animal structure, but I fancy he was right when he referred to the “‘ horns ”’ of the Hornbills as an actual hindrance in food-getting. It would be interesting to know whether the great helmet only developed after the birds had become more definitely fruit-eaters, or whether the in- convenience of possessing it tended to develop their diet in that direction. | There is probably, however, some connection between the adoption of a vegetable diet and large size, for nearly all the biggest birds are either vegetable. or carrion-feeders, i.¢. eat food which does not require mobility to obtain it, and can be obtained in bulk if at all, so that, if the digestion permits its assimilation, size is favoured and tends to increase. Reverting to the Woodpecker-Barbet-Toucan alliance, it is interesting to note that the Wood- peckers in spite of their specialization for grub- 52 BIRD BEHAVIOUR hunting under tree-bark, are in many cases fruit- eaters ; our own Greater Spotted Woodpecker, for instance, eats several kinds of fruit, and in North America the Red-headed Woodpecker (Melanerpes erythrocephalus) used at any rate to have a very bad name as a fruit-eater, even going so far as to go off with an apple spiked on its bill when leaving the orchard, so says Wilson; and one has even special- ized in a most peculiar vegetable food, the cambium or inner bark of trees and their sap. ‘This is the Sapsucker (Sphyrapicus varius) of North America, which is often quite a pest by its trick of girdling fruit-trees with its rows of punctures made to ex- tract the sap. ‘The worst of it is that its name and bad reputation have got transferred to other small Woodpeckers ; just as among us the comparatively harmless Kestrel often has to suffer for the misdeeds of the Sparrow-hawk, which really is an inveterate bird-killer, not confining its ravages by any means to Sparrows, but tackling anything from a Blue-tit to a Woodpigeon, so that in its game-list the chicks of Pheasants and Fowls are quite naturally included. I have spoken of the specialization of the Wood- pecker’s bill for grub-hunting, but this is not very striking at first sight, and the degree to which the tip of the bill is formed like a chisel is somewhat variable; it is the hardness of texture that is the important point, and the skill of the bird in using its tool. ‘The Great Black Woodpecker has been seen in captivity to chip two parallel grooves down CROWS AS WOODCUTTERS 53 an upright post and then prise out the intervening piece, thus going to work in quite a systematic way. It is of interest to find that in the unspecialized Barbets the power of wood-cutting occurs, though apparently only used for hewing out the nest- hele; but the state of the back of the cage in which a Great Barbet was confined at the Zoo was ample evidence that this bird’s powers in this respect are considerable, though the beak is merely Crow-like. The Crows themselves, however, with their usual versatility, can do a good deal in the way of wood-cutting with their stout bills; Mr. J. Fros- tick, of Balham, once showed me a Carrion-crow he kept as a pet, and its cage afforded ample evidence of the wood-cutting proclivities of its inmate; and readers of “‘ Barnaby Rudge” will be familiar with the feat of one of Dickens’s real Ravens whose bio- graphies are described in the introduction, though the amount of damage done to the “ six stairs and a landing,’ which he “ tore up and swallowed in splinters”? is of course humorously exaggerated. The greatest power of wood-cutting is, however, as every one knows, to be seen in Parrots; it is perhaps for this that their very peculiar bills became so specialized in hardness, shortness, and power, for they mostly build in holes in trees, and are not averse to making holes, either in trees or cliffs, for themselves. Besides, many of them are grub- eaters, and cut away wood in order to obtain their prey, quite taking the place of Woodpeckers in the 54 BIRD BEHAVIOUR Australian region, where these otherwise universally distributed birds are absent. The chief grub-eaters are the Black Cockatoos (Calyptorhynchus) of Australia and the curious New Zealand Parrots known as Kakas (Nestor); but the habit is probably commoner than is supposed, since most Parrots in captivity evince a liking for animal food, although too much of this is bad for them, often causing a skin-irritation and the adoption of the feather-plucking habit. This, however, has probably more to do with the want of exercise. It seems improbable that the Parrots should have developed their extraordinary deep-curved bill, unique among vertebrates in its hinged upper jaw and extreme biting power, merely to feed on seeds and fruit, and it is noteworthy that the Parrot which has the least typical beak, Pesquet’s Parrot of New Guinea (Dasyptilus pesquetr), in which the upper jaw at any rate is more like an Eagle’s than a Parrot’s, tears at its food of fruit like a carnivorous bird at flesh, and also has less Parrot-like movements than the rest of its tribe, hopping from bough to bough with a flicking action of the wings—evidently it has not fully attained the Parrot specialization in form or action, and corresponds among the Parrots to the Magpie-Goose among the Ducks. The White Cockatoos, which are generally ground-feeders, use their bills much in digging up - bulbs and the egg-cases of locusts; in the Long- nosed Cockatoos (Licmetis), which are especially addicted to a diet of roots, the upper bill is par- LYRE-BIRDS (MALE AND FEMALE), The Lyre-bird is the largest of singing-birds, and is one of the few birds which shows decorative plumage without brilliant colours. (Copyright, Hutchinson & Co, 54 HPN ose | IMPERIAL WOODPECKERS. This American bird is the largest of the Woodpeckers, and shows the rare peculiarity of the female’s crest being longer than the male’s. SCRATCHERS AND SEIZERS 5 ticularly prolonged and forms a most effective hoe. Another hoeing genus, in a very different family, is that of the Monauls (Lophophorus) among the game- birds, best-known in the person of the splendid ““Impeyan Pheasant’; this bird will continue hoeing by the hour, in search of roots and grubs, and scratches very little, although belonging to a group which are particularly characterized by using the feet in this way in search of food. In fact, the Game-birds used to be known by the general title of Rasores or scratchers, and every one knows what execution they can do in this way. Their scratching instinct and capacity, in fact, is no doubt one of their strongest assets in the struggle for existence ; the habit is not acommon one among birds when applied to food-getting, though it crops up again amongst the Passerines; the Whydah- birds among the Finches, for instance, are scratchers, and so is our Bearded Reedling. ‘The Lyre-bird (Menura superba), too, is a most powerful scratcher ; indeed, it actually grips clods and throws them back, shifting masses of as much as seven pounds in weight, although not bigger than a Fowl. The feet, however, are only employed in actually seizing food in the birds of prey—Hawks, Eagles, and Owls—and in these are specialized for the purpose, being armed, as every one knows, with particularly long and sharp claws, and having a most powerful grip, at least in the typical forms. There are some interesting minor specializations among these birds; thus, the especially bird- 56 BIRD BEHAVIOUR killing kinds, such as Sparrow-hawks and Falcons, have very long toes and talons, to give the greatest chance of a grip on an elusive prey seized on the wing. The Falcons usually strike from above, and often kill the prey, when brought down by the talons, with the beak; the Sparrow-hawks chase and clutch, and kill more slowly by their relentless grip. Reiieeiuae Hawks and Eagles have, on the other hand, particularly short toes, adapted to the usually narrow bodies of their prey, and fish-eaters, of which the Osprey is of course the most typical, have the underside of the toes roughened with little spikes, to give them a secure grip of their slippery quarry. It will be noticed that the Sea- Eagles and the great Fishing-Owls of the East (Scotopelia in Africa, and Ketupa in Asia) have ordinary bare legs, adapted to immersion, whereas ordinary Owls and most of the hunting Eagles are feather-legged. "The adaptation here is, however, probably special only in the case of the Owls, for Hawks, which are seldom fishers, are generally bare-legged, as is also the great Harpy-Eagle (Thrasaétus harpyta), which has far the most power- ful feet of all the birds of prey, the toes being as thick as a man’s thumb, and the claws as big as a bear’s. The strength of these birds is something enor- mous, and in proportion to their size is greater than that of the quadruped carnivora; the Goshawk, a giant Sparrow-hawk, can if a strong female (this sex THE PROWESS OF EAGLES 57 being the larger in birds of prey generally, and especi- ally in this typical Hawk group) actually hold and kill a hare, a creature several times its own weight ; and the Indian River-Eagle (Haliaétus leucoryphus), a lighter and less powerful bird than the Golden Eagle, can not only carry off a Greylag Goose, but has been known to strike, lift, and land a fish of a stone in weight, though this quarry taxed its powers to the uttermost, and it could not raise it again when frightened by a shot. In cases like this the impetus of the swoop no doubt counts for a great deal. | As for the Golden Eagle, it can even master the wolf, a beast not only far heavier than itself, but terribly armed to boot with most punishing teeth ; it is habitually flown at this quarry by Mongolian magnates, but many birds meet their fate in learn- ing their trade, for after the first grip with one foot is made good, the bird must be quick and dexterous in grappling the beast’s face with the other foot to avoid fatal reprisals. The cases in which birds of prey have been found killed by animals of the weasel kind which they had seized are evidently examples of nature’s penalty on the bungler, and no doubt exemplify a powerful check on these birds, which otherwise would have few casualties to face except in encounters with each other. The great Owls are not inferior in relative power and ferocity to the Eagles; a Snowy Owl kept in captivity in Shetland, according to the account. of 58 BIRD BEHAVIOUR Saxby, in his book on the birds of that country, once seized upon a cat, and held it in such a powerful grip that had not puss been rescued in time it would have succeeded in its amiable intention of biting her head off. In contrast to these powerful and ferocious species, we find many birds of prey which feed largely on insects, such as the Hobby and Kestrel among the Falcons, and the little Scops Owls among the nocturnal birds of prey; in both cases the insectivorous forms being closely allied to highly carnivorous ones, for the Hobby is very like a miniature of the arch-bird-killer, the Peregrine, and the Scops Owls are only distinguished by size from the particularly powerful and savage Hagle- Owls of the genus Bubo. Among birds of prey a very near approach to cannibalism occurs in the Barred Owl of North America (Syrnium nebulosum), which has an un- enviable reputation for devouring its smaller rela- tives; and the Peregrine Falcon frequently preys — on the Kestrel. However, this habit is more widely spread than might perhaps be supposed ; the great carrion-eating Petrel known by sailors as the “‘ Nelly” (Ossi{raga gigantea) remorselessly devours the smaller Petrels, and the Skua Gull or Bonxie feeds on the Kittiwake Gull. Moreover, the Shrikes, some of which are every bit as carnivorous as the Hawks, are only passerine birds, so when they prey on Finches and Thrushes they also are eating near relatives; the Shrike in fact is but a song- CROWS AS EXPERIMENTERS 59 bird modified into a bird of prey, and even yet “‘ mislodging music in a pitiless breast.” Unlike the typical true birds of prey, however, it seizes with the bill, not the feet, which differ little from those of ordinary passerine birds. The foot-grasping habit is so rooted in most of the birds of prey proper that even the insectivorous ones catch their small prey with the feet; it 1s a common and absurd sight in India when the white- ants or termites are swarming, to see such big birds as Kites (Milvus govinda) catching these tiny things in their raptorial talons, with which they can grip and carry off a rat. There are, however, cases in which the adapta- tion here is not complete; the Caracara Hawk of America (Polyborus tharus), though seizing birds on the wing with the feet—a feat it seldom performs, by the way—picks up ground-prey with its beak, afterwards transferring it to the feet when in flight, as Mr. Hudson informs us. I have seen the Indian Crow (Corvus splendens) thus transfer an object from bill to feet, as if he wanted to learn the Kite’s trick of foot-carrying; but the object was not food—the Crow is too practical to experi- ment with anything so valuable, and a bit of stick or dry cow-dung was the subject of the experiment. Some very curious specializations in the feeding habits of birds of prey deserve mention here; those of the Snail- Hawk (Rostrhamus sociabilis) and Bird’s- nesting Eagle (Neopus malayensis). The Snail-Hawk is a Buzzard-like, brown bird with a 60 BIRD BEHAVIOUR very long hook to the beak and long talons; it feeds chiefly on water-snails of the genus Ampullaria, very common in shallow pond-edges in the tropics, but, one would think, very queer food for a Hawk. The long hook of the bill and long talons may be adapted for winkle-pin and shell-grippers respec- tively, but from what will be said directly it is possible that the adaptation may be only apparent. The ways of the Bird’s-nesting Eagle are still more strange. This species, from South-eastern Asia, has black plumage and a most peculiar foot, with the claws very long except on the outer front toe, which is quite dwarfed. Its habit is to sail over the tree-tops looking for the nests of small birds, which when found it carries off in its long - claws, meanwhile ransacking them for the eggs and young, on which it makes its meal in mid-air. Eating on the wing, by the way, is quite a - common accomplishment with birds of prey which capture light quarry; it was quite the usual thing in Calcutta to see a Kite sailing overhead and tearing at something held in its talons. Once one dropped a bullock’s eye almost on me, having no doubt found the tough morsel non-negotiable. Better known than the Snail-Hawk and the Bird’s-nester is the Secretary-bird of Africa, which is, indeed, one of the best known of all birds of prey. Most people are familiar with its quaint. appearance, as of an Eagle on stilts (I can never see why it should ever have been called the Secretary Vulture); the short toes should, however, be THE SECRETARY AND SNAKES 61 noted, and the method of attacking prey, which the keepers at the Zoo will always display with the aid of a.dead rat tied toa string. It will be noted that the bird strikes on the prey to kill it, and does not grasp, using one foot at a time, and so quickly that it gets in two or three blows where a man could only give one; in fact, I am told that the bird will even kill blue-bottles in this way. The wings are kept lifted meanwhile, no doubt in readiness to spring back if the victim retaliates. But in its conflicts with snakes, which have gained it so much notoriety and the protection of our Govern- ment in Africa, it is said to bring the wings into action to beat the reptile down. Its prey, how- ever, is not restricted to snakes, but includes any sort of ground animal it can find and kill; in fact, Major J. Stevenson-Hamilton, the Game Warden of the Transvaal, says in his fascinating book ‘“‘ Animal Life in Africa,” that it is neither more nor less of a snake-eater than other large birds of prey, so that we cannot regard its peculiar specialization as being an adaptation to a reptilian diet. In fact, we may easily make mistakes in trying to correlate structure and function, as may be realized in considering the case of the Kea Parrot (Nestor notabilis) of New Zealand. Notable, indeed, this bird is, not to say notorious, but not in the way its describer meant when he gave it its scientific name. Every one knows now that it has undergone one of the most remarkable changes of habit ever recorded of any animal. Formerly a feeder on 62 BIRD BEHAVIOUR roots, berries, grubs, etc., it soon after the intro- duction of sheep into its haunts in the New Zealand Alps became a most cruel and destructive carnivore, with a ghoulish appetite for live mutton, attacking the sheep at the loins and eating deeply into their flesh. It was at first credited with the desire of devouring the kidneys or the fat surrounding them, but this view appears to be a mistake, the locality of attack being merely the part where the unhappy sheep had no chance of dislodging its tormentor. Of course so extraordinary a habit as this fell under the ban of museum scepticism, but it has been proved up to the hilt. Rewards are paid for the killing of these birds, and, unlike all other New Zealand birds except the Weka Rail (which is destructive to eggs and chickens), it may be sent out of the country. It is a curious thing, however, that specimens sent to the London Zoo soon give up the habit of eating meat and feed on the ordinary seed and other vegetable food given to Parrots; one lived there some years chiefly on carrots, thus reverting to its natural diet of roots. This would seem to indicate that hunger was the first incentive to the change of diet; the in- satiable inquisitiveness and destructiveness which are very characteristic of these Parrots would be quite sufficient incentive for them to attack dead sheep and offal, which they did before transferring their attentions, in a natural sequence, to the living animals. ‘They have been known to attack a horse, and the corpse of a man killed by a fall in the EAGLE ATTACKING MAN 63 mountains has also been mutilated by them, so that under certain circumstances of helplessness by accident or illness, they might easily become dangerous, just as rats are in similar circumstances. It is rare, however, for any birds to attack man for food; still, this would seem to be the motive for the attacks made on men in the water by Alba- trosses, as in the case where these sea-birds attacked the German sailors in the sea at our defeat of German ships in the sea-fight off the Falklands ; and no one with any wide knowledge of birds could doubt that Eagles probably were in former times, when they were more common and fire-arms less so, very serious enemies to children. It must be remembered that only a very few years ago a case was recorded in the Feld in which a Golden Eagle attacked an adult in Scotland, though in this case the motive was apparently revenge, as the man, a gamekeeper, had rescued a Grouse from it earlier on the same day. Hassel- quist, also, in his ‘‘ ‘Travels in the Levant,”’ published in the eighteenth century, credits an Owl, which he calls Strix orientalis, but which is apparently only - the Common Barn-Owl from his description and attribution to it of building-haunting habits, with coming into houses in Syria at night, and destroying babies if not carefully watched. I may say that on taking a little boy of two years old with his parents to see the Owls at the Zoo some years ago I noticed that all the large Eagle Owls abandoned their usual apathetic unseeing 64 BIRD BEHAVIOUR stare, and glared down earnestly at the child; and though I could not understand this at the time, on finding Hasselquist’s note it struck me that a child-killing Owl might not be at all an impos- sibility. To return to the Kea; Smith Woodward has suggested, in Mivart’s book on birds, that these Parrots used in the days of the existence of the great Emu-like Moas in New Zealand to attack and vivisect these now extinct birds in the same manner as their descendants now do the introduced sheep; and the possibility of this must of course be borne in mind. The large struthious birds at the present day seem peculiarly helpless against the attacks of smaller birds; in the Calcutta Zoo Crows have lined a nest of feathers pecked from the back of an Emu, and have pecked sores on the backs of Ostriches. This did not happen in my time, but I have seen a Crow sit on the back of an Ostrich and peck it. | If the Kea were thus always more or less carni- vorous, its peculiarities would be easily understood ; it is, as a matter of fact, in gait and movements much more like a Raven than a Parrot, running freely, and hopping frequently, while it is said often to sail on outspread wings when in flight. Its beak also, very long for a Parrot’s and with a comparatively gentle curve of the upper jaw, and its comparatively long legs, with its very dull olive-green plumage, suggest a carnivorous bird rather than a Parrot; but after all, these peculiarities CHANGES IN FEEDING 65 may simply be due to its being, like the eagle- billed Pesquet’s Parrot, an unspecialized early form. Its reversion to a vegetable diet in captivity may point the same way; in any case it is instructive to notice, that, unspecialized as it is, its beak has at any rate a good share of typical Parrot power, judging by its exploits in the way of gnawing wood. I have also seen, when a couple were kept in a cage in the indoor parrot-house at the Zoo, one cracking canary-seed, while the other amused itself by levering up the perch in the next cage hard alongside, for the discomfiture of the inmates. The Kea’s is not only the most notorious, but really the most remarkable change of diet known ; but minor changes are often recorded, and though these are often brought about by man’s interference in producing a new food-supply or in transporting birds from one country to another, they must not be despised as unworthy of study on that account, since in undisturbed Nature the equilibrium we hear so much about is not constant. Birds colonize areas on their own initiative occasionally, and plants even invade new habitats as circumstances become more favourable for them, so that there are always opportunities for changes of diet. Mr. Hudson has recorded how, since the giant grasses of the Argentine pampas have given place to the turf-making grasses and clovers of Europe, the Chaja or Crested Screamer (Chauna chavaria), which used to feed on water-plants, has taken to grazing on land; it is a curious thing that the 5 . 66 BIRD BEHAVIOUR fowl-like beak of this bird looks much more suitable for such a diet than for aquatic herbage, for which the broad bills of Swans and Ducks are better fitted; and in fact ‘the most purely terrestrial Geese show a great reduction in the size of the beak compared with the rest of the family. So that, as in the case of the Kea, the new habit seems quite in conformity with the structure. It has been noted in New Zealand, also, that the native Pigeon (Carpophaga nove-zealandi@), natur- ally purely a tree-bird and a feeder on berries and buds, has been found feeding on the ground in rape-fields ; and a similar change has very probably taken place in the habits of our Wood-Pigeon, which in the primitive state of Europe was probably much more exclusively a feeder on tree-produce than it is to-day, when the grain and root-crops, and the clover of the meadows, tempt it to feed a great deal on the ground; here it can be seen to be not quite in its element, for it is far less quick in walking than the common Pigeon, a true ground- . feeder, and seems not to be able to run, alae taking wing when pressed. The Wood-Pigeon, as can be easily observed in our London parks, is a good example of the extra- ordinary gluttony of some birds; there is some excuse for its greedy feeding when its food consists of herbs, buds, etc., but it keeps up the custom on receiving the public dole of bread and monkey- nuts, which latter it swallows with the husk enclosing them. One evening I began to toss a few of these GLUTTONS AND DRUNKARDS _ 67 nuts to a Pigeon I encountered just to see how many it would take; but after eating a couple, it only took the next two or three in its bill and pettishly threw them aside, after which it flew off. Evidently it was already full-fed, but could not resist the temptation to swallow a little more, and its discomfiture reminded me of the story of the glutton Quin, who, after eating all he could of the homely joint of boiled aitchbone of beef, actually burst into tears, after toying with a slice from a roast haunch of venison, which his host, knowing his weakness, had kept in reserve till he should be hors de combat. I have also heard of a case in which some Turkeys kept on one of the Channel Islands obtained access to a garden in which there were mulberry trees, and gorged themselves till they died from the effects of their meal. Birds will even get drunk, or something very like it; the Jungle-Fowl of Southern India (Gallus sonnerati) and of Ceylon (G. lafayettt) Wteed) freely .on the fruit of plants of the genus Strobilanthes, which so stupefies them that they can be knocked over with a stick; and in South Africa Bulbuls (Pycnonotus tricolor) feed on the fermented berries of the Cape gooseberry, which so intoxicate them that they cannot fly straight or far. Many years ago, when a boy at Maidstone, I had an opportunity of seeing that a bird may appear to enjoy the feeling of intoxication. Having read that small birds could be caught by offering them turnip-seed soaked in whiskey, I tried the 68 BIRD BEHAVIOUR experiment, it being winter-time with snow on the ground. Only one bird responded to the alcoholic invitation, a cock Chaffinch, which after partaking was visibly overcome, but able to escape capture; and I retired myself with a feeling of some compunction, fearing he might fall a victim. to some cat in his irresponsible condition. But | might have spared my pity; for next morning, a - cock Chaffinch, with ruffled plumage and in an aggressive mood, was finishing the medicated seed and keeping off the Sparrows, who were now quite ~ ready to experiment themselves. After this, I can believe a story which was told me in India by a bird-dealer, to the effect that if you gave a bird an opium pill and then released it, it would come again next day for a repetition of the dose. Of course the Vulture and the Cormorant are re- garded as the stock examples of gastronomical excess in birds; but I doubt if this is just. ‘They cer- tainly can perform phenomenal gorging feats, but it must be remembered that the Cormorant must at any rate search and work hard for its food, and that the Vulture’s meals are very intermittent. From what I saw in India, where Vultures were practically always on view aloft at some time of the day and somewhere, while one could seldom see them feeding, I came to the conclusion that they probably only got a meal about once a week, so that if they indulged heavily at such times they could not fairly be accused of gluttony. It will be UNAPPETISING RATIONS 69 noticed that in confinement, where Vultures are fed regularly, they do not by any means eat im- moderately ; a piece of meat the size of a good big steak will suffice for the daily meal of a bird as big as a Turkey. Mr. Beebe, the Bird Curator of the New York Zoo, found that Vultures in captivity preferred fresh to tainted meat, and an attempt made some years ago to feed the Vultures on entrails instead of flesh at our London establishment did not meet with success, so that it is pretty obvious that these birds in a state of nature are often forced by hunger to consume substances which they do not really appreciate. The extreme case of this is that of the small White Scavenger Vultures (Neophron) which habitually feed on excrement, not being strong enough to contend with the larger Vultures for carrion; ‘Tristram in Palestine saw them looking on wistfully while Griffon Vultures tore at a carcase, to which they eagerly rushed as soon as the big birds retired at his approach, only to be driven off when their tyrants deemed it safe to come back again. It is well known, too, that hawthorn-berries form an important part of the food of our familiar birds of the Thrush tribe, and of Wood-Pigeons ; yet during several London winters, which have been mild, I have noticed that haws hung on the trees till spring, untouched by the numerous Blackbirds, ‘Thrushes, and Wood-Pigeons that fre- quent Regent’s Park, showing that these berries are 70 BIRD BEHAVIOUR really emergency rations, which are seldom touched so long as more palatable food is obtainable. Holly- berries are known to be even less favoured, while on the other hand the berries of the mountain-ash are soon eaten up, and Mr. Hudson has described Missel-Thrushes coming to yew-trees on the downs again and again, disgorging these berries half- digested in order to return to the feast, a piece of depravity only to be compared to the practices of the gluttons of ancient Rome, who were wont to go out to be sick in the middle of dinner. Most observant people have seen, too, how the Starlings strip the elders of their berries as soon as these are ripe, and in India I found their relatives, the various Mynahs, equally attentive to the berries of the peepul fig (Ficus religiosa), which were also attractive to the Barbets; the Bulbuls especially revelled in the berries of the introduced Lantana shrub, though in winter I have seen them eating buds, though with no goodwill, the buds being evidently only taken in default of better food. The tree most attractive to birds I have ever seen, however, is the whitebeam (Pyrus aria), at any rate in the case of a specimen which used to stand close to the South Gate of the Zoological Gardens before the new Eagle Aviary was built. When this was hung with its large orange haw-like berries, it was constantly frequented by Starlings (which certainly do not eat ordinary haws if they can help it), Blackbirds, and Wood-Pigeons, all intent on feeding on the fruit as long as it lasted; WORMS NOT APPRECIATED 71 I once even saw a Moorhen in the top of the tree, and although I did not actually see it feeding, unless it was there after the fruit I do not know what its business was, there being a much more natural haunt for it in the rushes and shrubbery of the Three-island Pond a few yards away. The traditional diet of worms is probably not so entirely to the taste of birds as one would sup- pose; at any rate, on keeping a wild-caught Missel- Thrush in a cage I noticed that it would not come down from its perch for an earth-worm unless I stood well away, while a mealworm (an indoor- living beetle-grub which it could hardly come across naturally) would bring it to the floor at once. A Song-Thrush also I knew in India and supplied with gentles would not eat the local earthworms. I may say these had a very peculiar faint, sickly smell; but on the other hand I cer- tainly rarely saw wild birds eating these—the only instances I can remember of seeing a bird with a worm in its possession being those of a Brown Shrike (Lanius cristatus)—a bird very like the hen of our Red-backed Shrike; the White-breasted Kingfisher (Halcyon smyrnensis), which is more a hunter than a fisher; and the common Babbling- Thrush (Crateropus canorus), which I have often seen, on the other hand, pecking away at the earth- galleries of the termites. When these “‘ white-ants ” swarm, they furnish a free supper for a great variety of insectivorous birds, notably the Crow (Corvus splendens), Kite 72 BIRD BEHAVIOUR (Milvus govinda), King-Crow (Dicrurus ater), and Roller (Coracias indica). Similarly one can see the swarming of the true ants greatly appreciated by our Sparrows and Starlings, the latter especially capturing them with almost Swallow-like skill; while on the other hand I have seen a Swallow reverse its natural habits by settling to pick these ants up off the ground. The most extraordinary aberration of feeding- habit I ever witnessed, however, was the behaviour of a Song-Thrush I watched at Oxford some years ago, as it was running along the edge of the stream that flows through Magdalen College grounds ; suddenly it dashed into the water and secured one of a shoal of minnows, which it beat on the ground and then swallowed whole. It is probable that fish are often eaten by land-birds when the opportunity presents itself, as they certainly are by water-birds not usually reckoned as fishers ; thus, | have seen a Coot I kept in India suddenly duck its head under and secure a little fish—and it must be remembered that to an insectivorous bird anything will serve for an insect if it is small enough. In India I have seen the House-Mynah (4eri- dotheres tristis) with a gecko lizard in its bill, and in Africa the exquisite Malachite Sun-bird (Nec- tarinia famosa), a nectar-eater by custom and structure, has been found to have fed on tiny © lizards; while in Britain the Missel-Thrush has not only been found preying on the young of the HIGH-FLAVOURED DAINTIES 73 Hedge-Sparrow, but even carrying off a young Song-Thrush—a feat nearer actual cannibalism than any of those recorded above of birds usually reckoned as predatory. Predatory birds of all families, by the way, gener- ally agree in their liking for mice; and these “‘ smelly ” little rodents are likewise much appreciated by omni- vorous feeders. -Fowls and Ducks will swallow them, and in experiments on the feeding of the common Crow of America (Corvus americanus), in captivity the experimenters found that it appeared to be impossible for a Crow to be so full that he would refuse a mouse, and that timid new-caught speci- mens would crowd to the front of the cage to seize one. And we all know the service that Gulls and Rooks, as well as Owls and Hawks, did in the vole plague in Scotland a few years ago. American investigators have also found that Crows especially affect, as investigation of stomach- contents shows, strong-smelling beetles, so that it is not safe to put down an insect as unpalatable simply because it smells nasty to us. In India I have found the great and very foul-odoured cock- roach (Periplaneta americana), an exotic and usually an indoor insect, was readily accepted not only by the Racket-tailed Drongo (Dissemurus paradiseus) and Babbling-Thrush in captivity, but also by the Brown Shrike outside, while I saw Kites and Sparrows also feed on casual specimens they had obtained. It is perhaps rather significant, however, that 74 BIRD BEHAVIOUR just as birds particularly readily eat termites, which are used as human food in Africa, so they are also particularly fond of grasshoppers and locusts, which are and have been more widely used as human food than any other insects, being even permitted to the Jews by the Mosaic law. Jerdon, whose obser- vations on Indian birds have never been superseded, though often amplified, considered that grass- hoppers were the staple food of insectivorous birds in India, and the observations of American investi- gators have shown that they are equally appreciated by the birds of North America. When locust-swarms invade a country, they are preyed on wholesale by a great variety of birds ; in the case of the only swarm—a very scattered one —I ever saw in India, it was amusing to see the Calcutta Sparrows, who probably had in few cases ever seen a locust before, valiantly tackle these huge shrimp-pink grasshoppers on the wing and bring them to the ground. Certain special kinds of birds also have long been known as the particular enemies of locusts, following them everywhere, and thus earning the gratitude of humanity ; of these the most noteworthy being the Rosy Pastor (Pastor roseus), the most beautiful of the Starlings, in Eastern Europe and in Asia, and the Pratincoles or Swallow-Plovers (Glareola) in Africa, where also another Starling (Dilophus carunculatus) is a well-known ‘‘ Locust-bird.” ~ Dragon-flies are also greatly appreciated by birds ; I have seen two very different species using them BUTTERFLIES AS BIRD DIET 75 to feed their young in our Museum grounds in Calcutta—the Red-eared Bulbul (Otocompsa emeria) a fruit-eating tree-bird, and the Indian Dabchick (Podicipes capensis). ‘The victims of the Bulbuls were always, so far as I saw, the slender small Agrionid types; so were the Dabchicks’ generally, and it was amusing to see the little divers sneak along with head lowered to the surface, and capture the resting insect with a sudden spring. I once saw a bright scarlet Libellulid offered to a young Dabchick, and once saw a Brown Shrike capture one of these red dragon-flies in repose. It is at such times, I fancy, that these most active of insects probably fall victims, and the same remark would apply to flies. Quick as these are on the ‘wing, I have seen the heavy, awkward-looking Muscovy Drake (Cairina moschata) waddle up and pick them off leaves with ease and certainty. To birds which are specialized for catching insects flying, such as Swifts, Swallows, etc., of course no flying insects present any difficulty, but it is significant that birds of this type, whose preying habits are so well known and conspicuous, rarely , seem to attack butterflies. No bird is known as the “* butterfly-catcher ’”? anywhere, though we have *‘bee-eaters’’? and “ fly-catchers,” and though moths are ravenously pursued, as one may see even in London with the Sparrow. ‘This is not to say that birds never eat butterflies, but that these do not form a common prey; in India I certainly did not see a bird attack or possess one oftener than 76 BIRD BEHAVIOUR once a year on the average, though particularly on the look-out for this, and the American investiga- tions on the food of birds showed that in 40,000 stomachs of insectivorous birds four butterflies only were found. CHAPTER IV Nutrition (continued)—Manipulation of food—Powers of digestion, differing in different groups—The formation of pellets or castings—Difference in the food of old and young in some cases—Different methods of feeding the young—Young assisting parents in feeding their juniors—Feeding of each other by the sexes—Drinking, and eating of such substances as salt and earth. GENERALLY speaking, there is little manipulation of food among birds, it being generally swallowed whole ; and in many cases the power of deglutition displayed is almost as remarkable as in the case of reptiles. Fish-eating birds have the greatest repu- tation for bolting huge morsels, but some of the vegetable-feeding groups are very good seconds, especially the large fruit-eating Pigeons, some of which are instrumental in disseminating the nutmeg by swallowing it for the sake of the investing iomace:’’ In accordance with this habit of wholesale swal- lowing, the tongue is of little importance in most birds; and although it is generally well-developed, it is very rarely protruded beyond the bill, and generally lies nearly inert within the lower jaw. In the Pelicans and their allies, Gannets, Cormorants, 77 78 BIRD BEHAVIOUR and Snake-birds (Plotus), it is a mere pimple-like rudiment, as it is also in the curious Shoe-billed Stork (Baleniceps rex); it is tempting in this case to put its disappearance down to the necessity for clearing the course for swallowing large prey, but it is very doubtful if this explanation is correct, for a very short tongue, if not an actually rudimentary one, occurs in groups with different feeding-habits, while both long and short tongues are found in groups where the food is the same. Thus, the animal-feeding Kingfishers and the mainly fruit-eating Hornbills both have very short tongues ; the Herons have long tongues, the Storks short ones—both animal-feeders. Among vegetable- feeders, the Toucans, though so like the Hornbills in their form and habits, especially with regard to the bill and its use, have long tongues; the Part- ridges have tongues of suitable length for their beaks, the Tinamous, so like them in feeding and general habits, very short ones, like their giant relatives of the flightless Ostrich tribe, all of which are short-tongued, including the small worm-eating Apteryx. It would seem, therefore, that in most cases the possession of a tongue proportionate to the bill or a very short one is a group-character, and that the organ is in a state of degeneration in many cases. I may mention, however, that in two cases I have seen birds indulge in the curious—for them—action of licking their chops; in that of the Heron (Ardea cinerea) and the Pied Kingfisher (Ceryle varia), both TONGUES AS FOOD-GETTERS = 79 fishers, but one long-tongued and the other short, though the beaks are so much alike. In some cases, however, the tongue may be useful and even of vital importance ; we have seen it is so in the Crossbill, and in the Woodpeckers in the various honey-feeding groups it is most instrumental in getting the food. Woodpeckers have the tongue very long and wormlike, and can protrude it to a distance at least equal to the length of the bill; the tip is horny and barbed along the sides, so that the organ not only acts as a probe but a grapple, and is used to drag out grubs, etc., that cannot be reached with the bill. In the Sapsucker above-mentioned the armature of the tip is slightly modified, so that it is more like a brush than a spear-head. I found in young specimens of the Indian Golden-backed Wood- pecker (Brachypterus aurantius), which I reared from the nest, that the end of the tongue is plain until the bird is fledged, the barbs not appearing till later; one very tame one I had gave tactile demonstrations of the use of the tongue as a probe, for she used not only to sound the top of my head with her bill in a most uncomplimentary way, but tickle my ears as if they were so many worm-holes. In our Wryneck the protrusibility of the tongue and its use in feeding on ants and their cocoons has long attracted notice; the quickness of action in this case is such that the ants’ cocoon appears to the observer to be attracted as by a magnet; in the bigger and slower-moving Woodpecker the 80 BIRD BEHAVIOUR worm-like tongue is conspicuous enough. No doubt the apparent attraction of the Wryneck’s food to its bill, and the bird’s queer snake-like movements under excitement, were what commended it to ancient sorcery as a love-charm; it was, as students of the classics know, bound to a wheel, which was spun as a love-charm, the “ iynx ” being invoked to bring the beloved person to the spinner. The custom, indeed, became proverbial; “ to spin the Wryneck ” at any one was the Greek equivalent for our “setting one’s cap ”’ at him. To turn from Wrynecks and witches to Wood- peckers; the extensile tongue is brought into play by others than the Sapsucker to procure vegetable juices; a Woodpecker in Jamaica (Me- lanerpes striolatus) makes itself very objectionable to planters by puncturing the rind of the sugar- cane and sucking out the juice; and another in Cuba (M. superciliaris) is such a pest by performing a similar feat in the orange-groves that it is, or used to be, the custom to turn the army on to Woodpecker-shooting when there was not a revolu- tion on hand to keep them healthily occupied. One of this species was some time ago in the pos- session of Mr. J. D. Hamlyn, the well-known bird- dealer, and used to amuse itself by using its tongue to grapple the tails of some Budgerigars or Grass- Parrakeets in the compartment immediately above it. These sap- and juice-sucking Woodpeckers natur- ally remind one of the true nectar-feeding birds, SYRUP-SIPHONS IN ACTION 81 of which the Humming-birds of America are far the best known; and it is a curious and interesting fact that the Humming-birds and Woodpeckers both have the tongue supported on C-springs, for in both the horns of the “‘ hyoid”’ bone, which supports the base of the tongue, are immensely long and slender, and curve right over the back of the head. ‘This is, however, only one of the cases in which a common internal character is no more important than a common external one, for there is no reagon to suppose from the rest of their structure that the Humming-birds and Wood- peckers are related; and the tongue itself is quite different in the Humming-birds, for though just as protrusible as the Woodpecker’s tongue, it is composed of two horny tubes lying parallel, each side of the tongue curling inward, and the whole forming a suction-pump most efficacious in sucking up honey from flowers. Syrup-sucking is only a side-line with the Wood- peckers, but with Humming-birds it is certainly the main business in many cases, though all eat insects more or less, and some, such as the plain- coloured “ Hermit” group (Phaéthornis and allies) do not visit flowers at all, but feed only on insects, for which they search the trunks of trees and the undersides of leaves, always hovering, however, just as the flower-feeding species do before the flowers. That Humming-birds are essentially syrup- drinkers is shown by the fact that they come readily to glasses of artificial syrup put out for them, and 6 82 BIRD BEHAVIOUR when newly captured will readily drink up syrup while held in the hand. So will the Sun-birds of the Old World—at any rate the two Asiatic species of which I have had experience, the Purple (Cz- nyris asiatica) and the Amethyst-rumped (C. zeylonica). These small and brilliantly coloured birds are often mistaken for Humming-birds, just as the Hornbills of the East are often called Toucans, the American birds in each case having obtained the earlier and greater reputation with the public at large, as well as with naturalists. And indeed the habits of the Toucans and Hornbills are sufficiently alike to afford a good excuse for this ; but the Sun-birds, charming little creatures though they are, seem commonplace after the fairy-like hovering Humming-birds, since they simply hop about like Tits or small Warblers, and do not hover more than those birds do. ‘Their tongue is also less specialized, though also tubular, but their diet is exactly the same, and Mr. A. Ezra, who had at the time of writing the only two living Humming- birds in this country—one specimen each of the Garnet-throated (Eulampis jugularis) and of Ricord’s (Sporadinus ricordi)—finds that they thrive well on the same fortified syrup, composed of honey, Mellin’s baby-food, and condensed milk, which has well served the various species of Sun-birds for which he first used it. Neither Sun-birds nor Humming-birds cansupport existence for long on a diet of sugar-syrup alone, BOURU FRIAR-BIRD, The head in this large Honey-eater is feathered, but the more typical Friar-birds are bald-headed, whence the name given them, 82 VEY} PIoryou aq TTA 47 | “GuIG-UVINA OF FONV IAN ASA SNIMOHS “LTOINO NANO | SUGAR AS A NUTRIENT 83 though they will live on it at times for weeks ; Mr. Hamlyn brought a specimen of the Malachite Sun-bird (Nectarinia famosa) all the way from South Africa on plain syrup only, and another London dealer, Mr. De Von, brought a Humming- bird—and a young one at that—over from the West Indies on the same simple diet. It is true that neither survived long, but these small birds must find more nutriment in sugar than it is gener- ally credited with affording. | Besides the Sun-birds, which are typical Passerines, another passerine group are well-known nectar- feeders; these are the Honey-eaters of Australasia, which are the common “small birds” of: that region; they are birds of quite ordinary appear- ance, for though some are very small and bright- hued, with long curved beaks, like Sun-birds, most are plain in tint, and in size equal Finches or even Thrushes and Jays, while their beaks are not very strongly curved. They have, however, a tubular tongue with a brush-tip, and feed mostly on honey when they can get it, though taking plenty of insects as well. All these honey-eating insectivores, by the way, capture insects with the beak, just as Woodpeckers often do. Other passerine birds scattered here and there in different groups are very fond of sweet juice, and have extensile if not very modified tongues for obtaining it; such are the lovely leaf-green Bulbuls of the genus Chloropsis in the East, the active Sidias among the Babblers, and the American a een. i 84 BIRD BEHAVIOUR Sugar-birds (Cereba) and their allies, which are supposed to be related to the fruit-eating Finch- like Tanagers, and certainly grade into them if a whole series is examined, though the typical long- billed Cerebas are so like Sun-birds that if they had been Oriental birds they certainly would have been classed with them. The most charming of all, the Yellow-winged Sugar-bird (Coereba cyanea) has often been exhibited at our large bird-shows. It is not surprising that the honey-sucking habit should have originated independently in several groups, for it occurs now and then in quite ordinary birds as an occasional trait. Gilbert White has described how the Lesser Whitethroat runs up the stem of the crown-imperial lily to sip the honey from the flowers; and in India the Pied Mynah (Sturnopastor contra), although the most insectivorous of the Mynahs in the ordinary way, attends without fail at the blossoming of the magnificent red- flowering cotton-tree. It is not without interest in this connection to note that our Starling, introduced into New Zealand, has learnt the habit of drinking honey, in this case from the flowers of the New Zealand flax (Phormium tenax). As this plant is grown in some parts of England, it would be of interest to know if our Starlings here have learnt this habit; if not, it would seem probable that in New Zealand the introduced birds have picked it up from a native honey-eater, the Tui or Parson-bird (Prosthemato- dera nove-zealandig), which curiously resembles HONEY-EATING PARROTS 85 them in plumage, being dark dull brown when young, and richly glossed with green and bronze when adult. Besides the family of Humming-birds and the various honey-sucking groups of Passerines above alluded to, there are honey-sucking Parrots, and in the case of these, too, the honey-sucking habit has evidently originated more than once quite independently. ‘These birds have longer and more protrusible tongues than other Parrots—though the difference is not great—but they differ in detail. - In the Lories, which are far the most numerous and best-known of these Parrots, the tongue has the papillz on its end much elongated, so as to form a very short-fibred brush; in the Nestors, of which only the Kaka or Forest-Parrot of New Zealand (Nestor meridionalis) and the sheep-worry- ing Kea survive, the end of the tongue is plain, but has under it a plate of horn not unlike the human nail, of which the end is split into bristles; while in the little Bat-Parrots (Loriculus), which are so peculiar in their habit of sleeping upside-down, the tongue is quite ordinary, although they are confirmed honey-eaters. It seems curious to find honey-eaters among such a group as the Parrots, with beaks so strongly specialized for cracking and crunching; and as a matter of fact some at all events of the syrup- sipping forms will eat seed in confinement, crack- ing it in quite the normal way, although too much of such food is said to give them fits. 86 BIRD BEHAVIOUR The power of cracking the harder seeds is very highly developed in the typical Parrots; as may usually be seen at the Zoo, the great Hyacinthine Macaw (Anodorhynchus hyacinthinus) can crack a Brazil nut with no more effort than a Canary bestows on a grain of hemp-seed. ‘This cracking and rejection of the husks of seed, etc., 1s particu- larly characteristic of Parrots, and of Finches among the Passerines, and in doing this the tongue undoubtedly comes into play to some extent, as may also be seen when a Parrot chews up a piece of food, as the larger species at any rate do, these showing the nearest approach to mastication that is found among birds. | The seed-cracking habit, however, occurs also in the thicker-billed Larks; the Larks, by the way, are a group particularly well exhibiting the grada- tion of beaks—our Skylark has an ordinary bill suitable for any purpose, picking up seed, shoots, or insects. From this a gradation can be traced to the long thin almost Hoopoe-like bill of the - great Desert Lark (Certhilauda alaudipes), only suited for digging and probing for insects; and on the other side to the great heavy seed-cracking bill of Clot-Bey’s Lark (Rhamphocorys clot-bey), which equals in size and strength that of most of the “* Grosbeaks ’? among the Finches. And as Larks are only passerine birds, and very much alike except for their beaks, the evolution here would seem to be comparatively recent. Like the honey-sucking habit, the seed-cracking ~ METHODS OF HUSKING SEEDS 87 habit crops up here and there; I have seen at the Zoo the small Red-billed African Hornbill (Lophoceros erythrorhynchus) cracking canary - seed with its great clumsy bill, though it was not very successful in rejecting the husk, and swallowed some of this as well as the grain. It is interesting, too, to offer monkey-nuts to Sea-gulls and Curassows, and see how they deal with this unknown food by crunching the brittle shell and then dropping it on the ground to pick up the disclosed nuts; it evi- dently only needs a little more skill to make them efficient seed-shellers. Some birds, without strength of bill to crack seed, get over the difficulty by holding it down with their feet, and splitting it with the bill; this is particularly characteristic of the Tits, and thus, I find, a Hooded Crow manipulates a monkey-nut. It is, of course, quite the usual custom of Tits and Crows to use their feet in holding any article of food which they need to divide, and in accord- ance with the general practice of birds which thus behave, they do not swallow their food in huge mouthfuls, but rather the reverse. Crows, indeed, may often be seen to gulp, apparently, large lumps ; but these are in reality only pouched beneath the tongue, to be afterwards disgorged and torn up. The habit of using the foot or feet when feeding is a comparatively uncommon one, and generally restricted to perching birds; it is very familiar and most perfectly developed among the Parrots, which hold up their food to their mouth in quite a 88 BIRD BEHAVIOUR human way, though it will be noticed that as the foot cannot be turned inwards, as it is by fruit- bats when behaving rather similarly, it is the knuckles or dorsal surface of the foot that is pre- sented to the mouth. The habit, however, of “fisting it’? when feeding is not universal among Parrots, being not practised by the little Love- birds (Agapornis), the Budgerigar (Melopsittacus), and no doubt many others. The Kea when holding food in the foot does not raise this, but rests it on the hock, so that it has to stoop to its food, thus showing the habit less perfectly developed, as one would expect from its less specialized struc- ture. It is in this way, too, that those passerine birds, other than Crows and Tits, which use their feet in feeding hold their food; such are the Shrikes and the Babblers, though the habit is not universal here either, albeit very characteristic of the more typical genera. Finches have very generally the habit of holding down food on to the perch with one foot, as any one may see on presenting the. family Canary with a piece of salad, but, as I re- marked in the first chapter, Sparrows do not do this, and no doubt other Finches are equally inept; but the point has probably never been worked out. Woodpeckers and Barbets seem not to use their feet in feeding, though the former will wedge an object into a crack to hammer it, like the passerine Nuthatch; but Toucans in some cases hold food FEET USED AS HANDS 89 down with one foot. Cuckoos rarely do so, but I have noted the habit in the Indian “‘ Crow-Phea- sant’ (Centropus sinensis) and the South American Guira or White Ani (Guwira guira), both of them birds which are more like Magpies than Cuckoos in form and general habits, so that it is interesting to find them reproducing a Magpie gesture also. The curious little fruit-eating Colies or Mouse~ birds of Africa also grapple food with one foot. Among birds of prey the habit of using the foot for prehension of food is apparently universal, as one would expect from the habit of actually cap- turing the food in this way. The food is usually so held down, but small objects may be grasped and held up to the mouth as by a Parrot, especially by Owls, which differ from Hawks and most birds which handle their food with their feet (to use a rather Hibernian expression) by bolting huge pieces -and even whole small animals such as mice, their swallowing capacity being very great. Even the Vultures, which do not usually seize live food, and the long-legged running Secretary-bird, use their feet in feeding, and the Cariama, which is so like the Secretary in many ways, though really nearer the Cranes and Rails, employs its foot in the same way. So does the Weka (Ocydromus) among the true Rails, and the Blue Moorhens (Porphyrio) hold up their food in one foot just like Parrots, ’a fact which was known to Pliny, who specially mentions it. Except for these, however, the habit is hardly 90 BIRD BEHAVIOUR known among ground- and water-birds; no swim- mer practises it, except the Skua Gull, and the common Fowl only in a casual and half-hearted way may put a foot on a piece of cabbage-leaf it is picking at. The Brush-Turkey (Catheturus lat- hamt), however, a less specialized bird, fairly grips its greenstuff; the habit seems commoner among Australian birds than elsewhere, for I noticed even one of the Honey-eaters, a Miner (Myzantha), hold a grape in this way, and a Fantail Flycatcher (Rhz- pidura tricolor) playfully grasping dead leaves, when these birds were on view at the Zoo. The details given above will seem to most orni- thologists hopelessly trivial, but the habit of using the foot or otherwise is a most important one to a bird; those not possessing it are always liable to starve or choke, the latter calamity being a very common one among fish-eating birds, whose sup- plies are intermittent, while except in the case of fishing birds of prey they have little notion of dividing their quarry should it prove to be un- manageable. ‘They do what they can by vigorously beating it on their perch in some cases, as in the case of the Kingfishers, and this habit of perch- whacking is also seen among the Bee-eaters and many other birds which do not supplement the bill with the foot. Similar is the custom of the Thrush in beating his snails against a stone; I have seen it do the same thing with a looped-up lob-worm, against the bottom bar of an iron railing, no doubt in order to BIRDS OF WEAK STOMACH gI prepare it for the tender stomachs of the young— a necessary preparation, for only while writing this book I was told of a case of a young captive Thrush being killed by being fed with worms by its human rearer, the annelids having fairly forced their way through the tender tissues out of the young bird’s body. This I can quite believe, as, though I have not witnessed such a misfortune myself, I have had birds of mine, which had eaten too many maggots, pass them not only undigested, but alive, and this not only in the case of a very tiny species, the Crimson-backed Flower-pecker (Diceum cruen- tatum), but even such a large one as the Gold-backed Woodpecker (Brachypternus aurantius); with soft vegetable food, too, I have seen the Crimson-breasted Barbet or “‘ Coppersmith’? (Xantholema hemato- cephala) pass sultana raisins entire. ‘This, however, and also the Flower-pecker, are fruit-eaters espe- cially; and such birds seem to have the weakest digestions of any, and correspondingly the greatest appetites; they are always gorging, and pass the food out in an almost unaltered condition, so that the structure of food swallowed is plainly perceptible. The same thing is noticeable with the fruit-eating bats. So sketchy, if I may use the expression, is the digestion of the little Tanagers of the genus Euphonia (one of which, the Violet Tanager (£. violacea), is not infrequently imported), the most typical fruit- eaters of a group which gradually grades into the 92 BIRD BEHAVIOUR seed-eating Finches, that they have practically no stomach, the dilatation of the digestive canal where this ought to be being so slight as easily to escape notice, so as to give the food a straight run through. As an opposite example of a small passerine bird with remarkable powers of digestion I may cite the Hedge-Sparrow, which, though not a Sparrow nor any sort of Finch, being an insectivorous bird by structure and relationships, has a curious fond- ness for seed, preferring it, when caged, to soft food, and swallows it whole, digesting even hemp- seed husk and all; moreover, with such an able digestion it has a vigorous appetite, eating continu- ally and voiding a corresponding amount. It will be noticed that, although seldom seen to pick up a morsel of perceptible size, this little bird is almost continually employed in eating when observed at liberty. The most perfectly organized digestive organs are found in the Pigeons, in which the crop, an enlargement of the gullet where the food is stored and macerated, is particularly large, and double, whereas in many birds it hardly exists, or is merely a temporary dilatation; in passerine birds which possess it, such as Finches, it appears when full as a bulge at the base of the neck above, not below as usual, and in birds of prey 1s most conspicuous, as it swells out through the feathers. Pigeons also — have the posterior or grinding part of the stomach —the gizzard—which in many birds is not differ- entiated from the soft anterior or digestive portion, GRINDERS AND SOLVENTS 93 particularly strong, and in some cases even provided with gristly or bony crushing-discs, in order to triturate nuts or the stones of fruit. The strong gizzard of Fowls and Ducks is also well known; that of the Turkey is so powerful that in the experiments of Spallanzani, who more than a century ago conducted experiments without any regard for humanity but with unimpeachable accuracy, a leaden ball studded with small lancets was found after eighteen hours with its armature destroyed, while the gizzard was discovered quite uninjured, when the Turkey was killed. And among the Ducks the shells of the hard molluscs and crustaceans that such sea-haunting forms as the Eider-duck feed upon are speedily reduced by the action of the gizzard to a substance resembling sand. No doubt the gastric juice has something to say in this result as well as the extraordinary power of the muscular contractions of the stomach ; for some birds with soft stomachs can do wonders in the way of reducing hard substances, such as bone. I have, for instance, given to the Goosander (Merganser castor), a fish-eating Duck with a soft stomach like a bird of prey, no less than forty fish about the size of small sprats, at a meal, just to see how many he could take; and there showed no signs of bone in the droppings that were passed. I had a similar experience with another fish-eater, the Indian Dwarf Cormorant (Phalacrocorax java- nicus), which also digests fish bones and all; a half- fledged young Indian Swift (Cypselus affinis) given 94 BIRD BEHAVIOUR to one of these birds was also digested with its bones and growing feathers. The Shag (Phalacrocorax graculus) and the Indian Darter (Plotus melanogaster) also digest their fish bones and all, but the Common Cormorant (P. carbo) casts pellets. This habit of pellet-casting is another that needs careful investigation ; unfortunately in many cases it is necessary to keep the bird in confinement to ascertain these points about digestion, and in the | case of pellet-casting one has to be on the watch, for the castings are not always thrown up every day. In some cases a species may be exceptional among its group, as in the case of the common Cormorant above noted; but commonly the casting of pellets or otherwise seems to be a group-character. It is very well-known among birds of prey, and the falconers of old were well aware that to keep their Hawks healthy it was necessary to provide them with some indigestible material with which the pellets might be formed, such as a tuft of wool dipped in blood to make it palatable. The fish-eating birds of prey throw up pellets as well as the flesh- and fowl-eaters; so do the Kingfishers, both the fishing ones and the land- feeding forms like the Australian Laughing Jackass (Dacelo gigas); so do Herons, Gulls, Rollers, and Bee-eaters; and among passerine birds, Shrikes, Thrushes, Flycatchers, and no doubt others. But the habit is not universal, and whatever may be said about the impossibility of digesting chitin, I have noticed no trace of insect remains among the BONES FOR BREAKFAST 95 excrement of such birds as Starlings and Babblers, which do not cast pellets either, so that it looks as if they were in possession of a chitin-solvent ; though perhaps microscopical investigation might reveal comminuted particles of it in the dung. ‘Spallanzani found that a captive Eagle, though casting pellets, did digest some portions of bones introduced into its stomach in a perforated tube wrapped in meat as a disguise ; it could also digest bread thus disguised, though it would not take it when openly offered, as Kites, even at liberty, will do. The Lammergeier or Bearded Vulture (Gypaétus barbatus) has probably the strongest digestive powers of any animal-feeder, since it habitually eats bare bones, coming to a carcass after the other Vultures have left it, and swallowing such bones as it can. Others it takes up into the air and drops on the ground, descending in order to eat up the fragments. It treats tortoises in the same way, and Crows and Gulls are known, by the way, to practise the same trick with mussels. The Great Adjutant Stork (Leptoptilus dubius) of India also swallows bones, but it does not wait till Vultures have left a carcass, but comes and drives them away from it, and gobbles down all it can swallow, flesh and bones alike. The Lammergeier eats not only bones and flesh, but ordure, like the Scavenger Vulture, and a Desert-Chough (Podoces hendersoni) feeds on the dung of beasts of burden, not merely picking out un- digested grain, as so many birds do, but swallowing 06 - BIRD BEHAVIOUR the matter wholesale. This brings us to the con- sideration of the power of some birds of eating, un- harmed, food which would be not merely repulsive but poisonous to ourselves, and even to other birds. For instance, the poisonous nature of the skin- secretion of toads is well known; yet I have known the common toad (Bufo vulgaris) eaten with impunity by the Laughing Jackass, and the Indian toad (B. melanostictus), which I never saw touched by Kites or Crows, by the Crow-Pheasant or Coucal, Pied Hornbill (Anthracoceros malabaricus) and Indian Roller (Coracias indica); the last two birds, it is true, were in captivity, but the Coucal, © which was a hand-reared one, I allowed to range free; but merely being in captivity will not make every bird eat so nauseous a mouthful as a toad, although under such conditions birds will often eat animals which are only moderately unpalatable, like some “ warningly-coloured ”’ insects. Bee-eaters eat wasps, as well as bees, and are probably immune to the sting, though the crushing process to which they subject their prey may put this out of action. The Laughing -'Thrushes (Garrulax group), in captivity at any rate, rub these stinging creatures against their own tail- feathers before eating them, and the Pekin Robin (Liothrix luteus), a smaller member of the same ' group of Babblers, treats black ants (red ones it will not eat) in a similar way. The object is no doubt to wipe off the acid exuded, for a lady fancier recorded in one of the bird-fanciers’ papers some HAIR IN THE STOMACH 97 years ago that a tame Starling did this with horse- radish which had been soaked in vinegar, a delicacy for which it promptly made when allowed to get to the meal-table. A more natural proceeding, one would think, would be to rub the offending morsel on the ground, a proceeding I have seen a captive Babbler (Crateropus canorus) of mine follow out with a caterpillar, armed with most penetrating spiny bristles, before eating it. Such caterpillars, as well as the softer-haired ones, are generally avoided by all birds, but as is well known, the Cuckoo eats them so freely that its stomach gets lined with their hairs, and the common Cuckoo of America (Coc- cyzus americanus) has the same habit; as this is a non-parasitic bird, it would seem that the habit of eating food unpalatable or dangerous to other birds is older in Cuckoos than the parasitic habit. When I was in Zanzibar in the early ’nineties I used every morning to see a pair of Glossy Cuckoos (Chalcococcyx cupreus) visit the little backyard of the hotel where I stayed to feed on the highly “‘ warning- coloured ”’ caterpillars of a moth of the same genus (Euproctis) as our “ gold-tail,’”’ and the toad-eating Coucal is a member of the Cuckoo family, though not parasitic, like the American Cuckoo. Every one knows that it would not be safe to follow the guidance of the birds in eating wild berries; a Hornbill, indeed, even feeds on the fruit of Strychnos nux-vomica, from which strychnine is obtained. Hutton also found, when collecting ", 98 BIRD BEHAVIOUR birds in the Himalayas, that when he poisoned a carcass with this drug, the Eagles which fed on it were killed, but the Vultures flew away unharmed. Tristram also records that when a pet Griffon Vulture of his devoured the contents of a half- pound pot of arsenical soap, the only result was a violent fit of vomiting. It is not surprising, per- haps, to find such endurance of virulent poisons amongst Vultures, whose ordinary food consists of putrid carrion, for it is well known that putrid or sour food is very dangerous to most birds other than carrion-feeders, even if they can be got to eat at. Some substances are taken in by birds for reasons that are at times hard to understand. ‘The well- known habit of grain-eaters and some omnivorous forms, like Crows, of swallowing sand and gravel is easily explicable, since these substances aid the gizzard in comminuting the food ; but it is difficult to see why Hawks, living on flesh, and casting up indigestible substances, should need to swallow gravel, which is shortly afterwards cast up again. As the stones are worn away by natural abrasion in the grain-eaters at all events, they are no doubt useful in supplying mineral matter to the body, just as the bits of shells and lime supplied to poultry are useful in providing shell-forming matter for the eggs. | Some birds also eat earth; a young Red-vented Bulbul (Pycnonotus bengalensis) I kept in India often did this, and I have seen a pair of an allied ~ EARTH AND SALT AS FOOD 99 race at the Zoo do the same; but I do not know if this is done by wild birds. M.G. Rogeron in his admirable work ‘‘ Les Canards,”’ credits Ducks with being able to extract nutriment from earth; he points out how eagerly tame Ducks ransack rain- puddles in a road after a shower, where there can be no animal or vegetable food to attract them, and recommends that earth be placed in the pans of water supplied to young Ducks which are being reared in confinement. I myself have seen Mallard in Hyde Park on a wet day bibbling assiduously in a puddle on the path, and though Ducks when doing this may be only getting gravel, it would not be so very remark- able if they and other birds could utilize earth as food, as we well know this to be done by earthworms, whose digestive organs are very like those of a bird in miniature, with a crop and a gizzard stocked with minute particles of grit all complete. It is not surprising that salt is liked by some birds, seeing the craving for this mineral is so widely spread ; it is chiefly consumed however by vegetable feeders such as Parrots and Pigeons, the last being particularly keen on it. ‘The Wood-Pigeon will drink salt water in order to obtain it; and whether it is liked or not, salt water must be drunk by the purely sea-birds such as Penguins, Auks, Petrels and marine Ducks like the Eider. Gulls, however, will come to fresh-water pools if they have the chance in order to drink the fresh water. Many birds, however, are curiously indifferent 100 BIRD BEHAVIOUR about water; either they do not drink at all, or only do so when water is easily to be had, not making a special search for it, and being able to do without it in captivity. There are the same differences among mammals, but it is curious that in this class the total abstainers are all herbivores, the carnivora drinking readily and regularly, while among birds it is most particularly the animal- feeding kinds which can dispense with the fluid, though some of the vegetable feeders can do so as well. Owls and Hawks, for instance, can live with- out drinking, though both do drink; in India it was a common sight to see Kites drinking at a pond. Kingfishers seem never to drink, either the fishing or the land-hunting kinds, though I did once . see a Laughing Jackass in the Calcutta Zoo make a sort of awkward attempt to do so. The aquatic- feeding kinds, like other fish-eating birds, no doubt swallow a good deal of water incidentally. ‘This must, one would think, especially apply to those few favoured birds which have learnt the trick of swallowing under water, so familiar in the case of the Penguins in the diving-tank in the Zoo. Gener- ally, however, a diving fisher comes up with its fish, but among the Cormorants one of the African species (Phalacrocorax capensis) can swallow under water, as also can the Shag (P. graculus). It is a curious thing that Humming-birds, Sun- birds, and Honey-eaters should drink water so ~ freely, living on liquid food so largely as they do; A DROUGHTY REGIMEN Io! the honey-eating Parrots are also free drinkers. Parrots generally, however, can do without drinking to a remarkable extent, and if supplied with moist food in captivity care little for water ; it used even to be the custom to bring over the little Budgerigars (Melopsittacus undulatus) from Australia on dry seed only, with no water during the whole voyage, though under this cruel régime there was naturally a large mortality. It is a curious point about some of the Parrots, by the way, Cockatoos for instance, that their mouths are dry inside, there being apparently no secretion of saliva. In ordinary birds the supply is limited, just enough to moisten the mouth, and such a thing as dribbling or spitting rarely occurs as far as I have seen. Hornbills and Bustards can also do without water; but I have seen both the Great Bustard and the Elate and Black Hornbills (Ceratogymna élata and C. atrata) drink in captivity ; the action of the Hornbills was very awkward, as they pecked up the water as it were, an action also characteristic of the Rhea or American Ostrich (Rhea americana). It may indicate that the habit is a comparatively new one, or that it is being lost. With the exception of Pigeons, Sand-Grouse, and the Gouldian Finch (Poéphila mirabilis) which drink in a continued draught like horses or cattle, the procedure of birds in drinking is very uniform, the water being scooped up in the lower jaw and allowed to run down the throat; nectar-feeders, however, lick up their drink with their tongues. It 102 BIRD BEHAVIOUR is curious that the rapid and efficient method of continuous drinking above mentioned is confined to such a few birds, especially as there is nothing in the form of their bills and tongues to account for it; similarly birds which swallow food under water have no special mechanism for facilitating this—it is merely a matter of ‘‘ having the knack of it’’ in both cases, evidently. The Sand-Grouse, though essentially desert-birds, have never become independent of water like the Bustards, no doubt having been spoilt, so to speak, by their wonderful wing-power, which makes it easy for them to visit even distant watering-places twice a day; and they even water their chicks in a perfectly unique way, first observed and re- corded in captive birds by Mr. Meade-Waldo. The male bird, which undertakes this duty, soaks his lower plumage in water and then goes to the chicks, which suck his wet feathers. The aviary bird of course had only to walk to his chicks, but the wild one must surely not have very far to fly to them if the device is to be of any use, since flying in the dry atmosphere of the places these birds frequent would soon dry the plumage. Generally speaking only birds which disgorge food for their young, like Pigeons, Parrots, Gulls, etc., can give them water, and it is not given in a special dose by these, so far as I am aware; the young get it incidentally, so to speak, with the food administered. Birds often feed their nestling young on food different from that which they ordinarily eat INSECTS FOR THE NURSERY _ 103 themselves, and even self-feeding chicks often show tastes in food different from those of adults. In almost every case the difference consists in the young bird’s diet being more animal in character than that of the old ones ; thus, Finches, which live mainly on seed and other vegetable food themselves, are frequently very largely insectivorous when feed- ing young, as any one may see with the common Sparrow. I found also the young Bulbul I men- tioned above would not swallow fruit if it could possibly help it, but gladly took flies and pea-meal paste (a common article of food for insectivorous birds among native fanciers in India), although the adults feed, I think, more on fruit than on insects. I have also referred above to the Red-eared Bulbuls catching dragon-flies for their young, though I never saw the adults eating these insects. This habit of feeding the young on insects is a - great stumbling-block to the class of fanciers, very numerous nowadays, who like to get their birds to breed in their aviaries, for birds are, in the case of species who believe in insects as a nursery regimen, so obstinate about it that they commonly refuse to use any substitute, at any rate during the early stages of rearing, and even, in the case of insec- tivorous birds, often give up eating the artificial mixture themselves. Probably the mental excite- ment due to parenthood produces a reversion to the state of mind of the newly-caught bird, which has to be gradually accustomed to the artificial diet, just as birds previously tame often conceal 104 BIRD BEHAVIOUR their nests and act suspiciously towards their owner when nesting. In some cases birds alter the diet as the young grow older; American investigators, for instance, have found that Grackles (Quiscalus) give the young as their first meals very tiny spiders, and I noticed that a pair of Indian Dabchicks (Podicipes capensis) 1 watched for years on our pond in the Museum grounds in Calcutta fed the young for the first week or so only on insects and small freshwater prawns, not on fish as well, as they did later on. With regard to the tastes of active self-feeding chicks, every one must have noticed the extreme activity of young Ducks in capturing flies, which seem to form their chief food; and the young of the Tufted Duck (Fuligula fuligula) catch small fish ; the Red Grouse also, one of the most limited of vegetarians when adult, feeding almost entirely on heather and bilberry, nevertheless is largely insectivorous when young, like the more omnivorous Pheasant and Partridge. Young Great Bustards are also far more animal feeders than the old birds, which are mainly vegetarian. I do not know of any bird which is vegetarian when young and afterwards takes to animal diet, but many can live on vegetable food from the first, such as Parrots among nestlings and goslings among the active type of young birds; I also found that young Indian Barbets of two species, the Blue-cheeked (Cyanops asiatica) and the above- WOOD FOR INFANT DIET 105 mentioned ‘‘ Coppersmith ”’ could be reared quite satisfactorily on banana only, though, to be sure, I did not get them for this purpose till half-fledged. Among ducklings, too, those of the Mandarin, and sometimes the Wigeon, graze when quite tiny, as well as hunting for insects. Birds certainly give some very queer things to their young at times; many years ago I saw at Oxford Starlings carrying bits of cherries which were not even quite ripe, to their young in the nest, so that I am not inclined to put down to confinement the action of some Indian House- Mynahs (Acridotheres tristis) 1 saw a few years ago breeding at the London Zoo, which regaled their offspring with bits of ivy leaves, though liberally supplied with insect food. Mrs. Johnstone, too, who first bred in this country the lovely Leadbeater’s Cockatoo (Cacatua leadbeateri) of Australia, says they fed the young mostly on rotten wood, of all things, a jejune diet which makes M. Rogeron’s suggestion that Ducks assimilate earth seem more probable. But the queerest article of diet for young birds is that supplied them by some of the larger Grebes —their own parents’ feathers; this is, of course, in harmony with the strange feather-eating habit of the old birds, which appear to be able to digest this strange diet, or at any rate to partially do so, since they do not cast pellets—as I know from care- ful observations on captive birds—and comminuted feathers have been detected in their intestines. I 106 BIRD BEHAVIOUR have seen a Great Crested Grebe at the Zoo eat about half-a-dozen feathers in a quarter of an hour, as they came out when it was pluming itself ; but I never saw Dabchicks either eat their own feathers or give any to their young. A very rare and interesting habit is that of young birds feeding each other; I only know of — two cases in which it is regularly done—those of the common Moorhen and apparently the Coot. In both cases it is the birds of the first brood, by this time nearly full-feathered but still unable to fly, which thus help their parents with the small downy chicks of the second batch; it is a common sight in the case of the Moorhens in the London parks, and it was in St. James’s Park that I saw a young Coot feeding its junior. This case was a particularly curious one, because I saw the feeding young bird actually cry for food to the parent, and on one occasion eat what it thus got itself, and another hand it over to the small chick. When rearing a brood of young Indian Rollers (Coractas indica) I noticed that, although so ravenous - that when they saw me coming with the raw meat on which I chiefly fed them they would not only yell lustily but start fighting vigorously, yet a bird which had had enough would feed another one with the next piece given it; this, however, was, lI expect, an abnormal piece of benevolence, chiefly prompted by the bird’s dislike to give up what it had once seized, while it could not itself swallow it. Similarly, the instinct of birds which disgorge LOVE-GIFTS OF TIT-BITS 107 to feed their young may often be excited by stuffing themselves; canary-breeders well know that the addition of a tasty item to the menu is the best way to start the old birds feeding the young ones vigorously. One of the most touchingly human actions of “ birds is the feeding of each other by the sexes ; eeneraily of the female by the male, which | 1s reasonable enough, since he has to conciliate her feelings, and any extra food that she may obtain without extra exertion is so much to the good, having in view the physiological demands made upon her during laying and sitting, to say nothing of the care of the young, in which she usually takes the chief part if not undertaking it altogether. Often the female is fed on the nest, as by the Rook ; © but this courtesy is often extended to her at other times, though more especially at the breeding-season; in fact, when one bird is seen to feed another, it is generally a sure sign of the pair having decided to enter on matrimonial affairs. The sight is common among our domesticated birds; the well-known ‘“‘ billing” of Pigeons and Doves'is merely the female being fed from the crop by the male, as the young are by~.both sexes ; the Cock gallantly calls the hens to any morsel he has found, and when food is thrown does not eat until they are all served; Canaries are so keen on feeding something when in breeding condition that they will, when cocks are kept, as usual, singly, disgorge food on the perch and eat it again, and 108 BIRD BEHAVIOUR Parrots will attempt to feed people for whom they entertain a peculiar regard. One may even see the Robin, solitary and selfish as it usually is, present a worm to its mate, and even among the Cuckoos, proverbial emblems of selfishness, I have seen the male of the Koel (Eudynamis honorata), the com- monest species of India and a fruit-eater, give to the female berries plucked from the bough on which they were both sitting. Here the action is the merest courtesy, conighapeaale to our habit of rising to open the door for a lady ; at the opposite extreme of supplying all the female’s necessities is the action of the Hornbills, among which the hen walls herself into the nesting-hole in a tree with a plaster of her own droppings, while the cock feeds her through a slit left in this, envelop- ing his contributions in a gelatinous envelope secreted from the coat of the stomach—its epithelial lining, in fact; at any rate, such bags of food have been disgorged by Hornbills in captivity and it has been assumed, perhaps too hastily, that the action was normal in nature also. The Hoopoe, an ally of the Hornbills, also assumes the entire responsi- bility of the maintenance of the sitting hen, though he does not encapsule her rations nor does she wall herself into the nest. One would naturally suppose that the habit of feeding the female would be generally adopted among birds; but it is doubtful if this is the case, © and there are certainly many exceptions even among groups in which, as in the above instances, the MALE BIRDS STAND TREAT _ tog kindly act is well known to the most ordinary observer. It seems to be universal in the Pigeon family, indeed; but it certainly is notin the poultry tribe; the Guinea-fowl feeds his hen like the common Cock, and so does the Satyr Tragopan (Tragopan satyra); but the common Pheasant and Peacock do not, nor do the Gold and Silver Pheasants. Quails do it, both the Harlequin Quail (Coturnix capensis) and the pigmy Painted Quail (Excalfactoria sinensis); I have seen nothing more quaintly appealing in bird life than the action of a cock Harlequin Quail in one of the Zoo aviaries, which came up to me and the keeper who was showing me through, drawn up to his full height and looking with such an obvious request that I asked instinctively ‘“‘ What does he want?” ‘‘ Meal- worms,” said my companion, “‘ but not for himself —for the hen,”’ and sure enough he honestly gave her every one he received. Feeding the hen is, I believe, as universal among Parrots as among Pigeons; but it certainly is not so among Finches—although Goldfinches and Lin- nets and many others do it; Sparrows certainly do mot, nor, I believe, do Chaitinches. But it. is dificult to prove a negative, and the action is often confined to birds in the height of breeding condition, of which it is among fanciers the well- known index, as has been stated above. Among birds of prey I have never seen a case, although Kites (Milvus govinda) were so common about Calcutta, and wife-feeding by their neigh- , / IIo BIRD BEHAVIOUR bours and rivals, the House-Crows (Corvus splendens), was one of the commonest actions to be observed ; but O. St. John saw one Kestrel feed another in Morayshire, and Mr. E. Selous has fully observed in Iceland the victualling of the hen Merlin by her mate when rearing young. | I cannot recall any case among waders and water- fowl, except among Terns, which feed the sitting hen and also make love-gifts when courting; pro- bably the habit is pretty widely spread among such fishing-birds which seek food away from home, but it cannot be taken for granted. Among the Duck tribe, affectionate mates as these are, the action is almost entirely confined to the Carolina or Wood Duck of North America (4% sponsa), which makes a show of his love-gift, holding his head and tail high up when offering it, this attitude being his display position. Neither Geese nor Swans, though life-pairers and very devoted, ever seem to feed their mates at any time. It is a curious fact that in at any rate some cases, when the rdles of the sexes are reversed, and the male incubates and cares for the young, the female is so masculinized that she not only fights for the male but feeds him ; at all events, this was observed by Mr. D. Seth-Smith, the Bird Curator at the Zoo, when as a private aviculturist he bred two species of Hemipodes or Button-Quails (Lurnix), © Quail-like birds in which the hen is the superior Sex. As this is not usually the case in birds which SELFISHNESS NO DRAWBACK 111 build tree or rock nests and have helpless young, female feeding must not be looked for here, although an observer of the home life of the Peregrine Falcon has noted that the hen, the larger and stronger bird, as is well known, supplied her smaller mate with food for the young, part of which he inci- dentally ate himself—a case exactly the opposite of that of the Merlins observed by Mr. Selous, although the two species are not remotely related and present just the same kind of sexual difference —with the advantage in size on the female side. Except when it goes so far as feeding the sitting or rearing hen and the young, it 1s doubtful whether this habit has any survival value of importance— it is merely the outcrop of kindliness of nature, similar to that which restrains some birds, such as the Cock and the male of the Cotton-teal (Nettapus coromandelianus) from retaliating on a female under attack from her. That it has little utilitarian significance is shown by the fact that the selfish Pheasant can seduce away a hen from the gallant and generous Cock if he can conquer him in combat, which is usually the case with all breeds of poultry but the Game; and the Carolina Duck will sometimes mate with the related Mandarin Drake, though this bird’s idea of politeness to the female, even of his own species, does not go further as a rule than not tudely squabbling with her for a morsel. I must admit, however, that I have once seen him go so far as awkwardly to drop the bit and let her take — fA 112 BIRD BEHAVIOUR it, but generally speaking, his extreme ostentation, combined with an inconsiderateness not shown by the more modestly and tastefully attired Carolina, looks as if it were designed as a satire on the human dandy, notoriously the worst and most indifferent of husbands. The parallel, however, would be a dangerous one, for except in generosity, the Man- darin yields little if at all to his American cousin as a lover. CHAP VER V. Fropagation—Care of voung—Different types of young birds— Different modes of feather-development, as seen in young Fowl, Pigeon, or Duck, for instance—Egg-coloration and its meaning and variations—Prolificacy and otherwise—Incuba- tion mounds—Periods of incubation. Tue care of old birds for their young has always attracted the attention of humanity, and one of the best known allusions to nature in the Bible is the text that speaks of the fowl gathering her young under her wings. As one would expect, it is gener- ally the hen that has most to do with the incubation of the eggs and the nursing, so to speak, of the young, while they are still so small and weak that they need to resort to a parent for warmth, being unable to keep up their temperature by themselves. This performance on the part of the parent is termed brooding or ‘“‘ hovering,’’ and in the cases where it can be watched, as in birds which brood their active young on the ground, it will be seen that the parent sits down on its heels, while the young run under and are sheltered by the plumage of the breast and sides. In the case of a young Avocet that was hatched and reared at the Zoo some years ago, it was interesting to see how the little 113 i A ce 114 BIRD BEHAVIOUR | thing would stand up under its long-legged parent, whose body was not very near the ground even with the legs bent, so that only its little legs were visible, the body being concealed in the parent’s feathers. Some birds, however, may brood their young on the back under the wings, like the common Mute Swan, in which this seems to be the habit of the female only ; in the case of a pair of the South American Black-necked Swan (Cygnus melancory- phus) which bred at the Zoo some years ago, how- ever, the male carried the cygnets in this way quite as often as the female, but this may not be normal with the species, as I never saw the male of the Kew pair do it when he had young—he seemed to spend most of his time in making unprovoked attacks or at least threatening naval demonstrations against the Geese. In Grebes the young are habitually carried in this way on the back of the swimming parent, at any rate at first, and I have been able to observe in the case of the eee Dabchick (Podicipes capensis) that the parent when brooding them on the nest at night also takes them on its back there; cer- tainly the wet nest would be a most inconvenient and probably unsafe bed for them, as they are far less hardy than young Ducks, and even these can easily have too much wet. Both of the pair of Dabchicks I watched carried the young, but espe- cially the bird I took to be the female, although it was the larger; coloration in Grebes is no help in fixing the: sex. While one bird carried the FEMINISM A FAILURE 115 chicks, the other hunted for food, so the co-operation was perfect. In many species, however, one sex does everything or nearly so, and this is generally the female, as remarked above, but extra-fatherly male birds occur, which take over all the ordinarily feminine duties. These comprise nearly all the ‘‘ Ratite” or primitive flightless birds—the Emu, Casso- waries, Rheas, and Kiwis or Apteryxes, but not the true Ostrich; the Partridge-like Tinamous of South America, which, although flyers, are really ** ratites *? by anatomical structure, with the excep- tion of the keel on the breast-bone ; the Hemipodes or Button-Quails, and the little Coot- footed Sand- pipers or Phalaropes. It will be noticed that although some of these birds are enormous in size, none are remarkable in any other way, so that the inference is pretty plain that feminism in the bird world, though quite a workable arrangement for reproducing the species, is not the way to produce a high type of birds, the great “runners ’’ being merely lumbering degener- ates except the one which has resisted feminism, the true Ostrich, which is a magnificent creature in his way, and holds his own in a region full of formidable mammals, both carnivores and herbi- vores. The so-called American Ostrich, the Rhea, seems to have got into a curious mixture of réles in his family affairs; unlike the Emu and Cassowaries, in which the males are purely feminine in char- 116 BIRD BEHAVIOUR acter, while the larger females are quarrelsome and non-incubators, he is larger and fiercer than the hens, and fights fiercely to win them from rival males, whereupon the ladies pool their eggs in the nest he scratches out, and leave all the rest of the work to him. A cock Rhea might have been seen in the London Zoo at the time of writing this, proudly escorting a brood of young, whose mother cared so little for them that she had to be driven away from the special food provided for their delecta- tion, which the father hardly touched; this eating of the young birds’ food by the indifferent mother being apparently the usual thing in such species. Generally, of course, if there is an indifferent parent it is the male especially if decorated; Cocks and Drakes, for instance, do not aid their mates in rearing the family, but the habit is not constant in groups. Male Partridges and Ganders protect the young, and the former even brood them; male Swans also sedulously guard their cygnets, as male Sheldrakes do their ducklings. In many birds there is a very fair division of labour, as with Pigeons, Sand-Grouse, and the true Ostrich, the cock doing half the work if not even more. Among the domestic Pigeons and Doves, for instance, it will be:noticed that while both feed the young indiscriminately, the sitting is very evenly divided, the cock sitting from about ten in the morning till about five in the evening, while the hen takes the rest of the time, and has perhaps the best of the bargain, as she would PIGEONS ADMINISTER PAP UL] Peyejto sit. quiet at night im any case. In the Ostrich and Sand-Grouse the reverse is the case, the hen sitting by day and the cock by night; the cock Ostrich, however, is said to show more solicitude about the young than the hen, and in the case of the Sand-Grouse it is the cock that waters the chicks as above described. The feeding of the young of Pigeons is accom- plished during the early infancy of the “ squeakers,”’ to use the fanciers’ appropriate technical term, by a curd-like substance actually secreted from the walls of the crop in both sexes; and as this, except for the absence of sugar, closely agrees with milk in chemical composition and properties, the old First of April expression “‘ Pigeon’s milk” is some- thing more than a mere joke. As the birds grow older this is mixed with half-digested food, and the secretion ceases altogether long before the birds are reared. Pigeons, by the way, feed their young by taking the bills of the young, which are soft and much bulged at the base, into their own, and pumping up the food into their mouths, whence the young suck it down; the method employed by Parrots is similar, and so is that of the Ibises. Very awk- ward indeed it looks, too, when the young Ibises are fledged and still want feeding, for though the bill of the nestling Ibis is not much longer than a young Pigeon’s, it is nearly full-length when the bird leaves the nest, and it looks a most unpleasant proceeding for the old bird to have a long bill 118 BIRD BEHAVIOUR thrust unceremoniously down its throat. But in the case of Penguins and of the Pelican group, including Cormorants and Gannets, matters go much further; at any rate the young bird does, for it gets its head and even neck well down the long-suffering parent’s gullet. I-well remember in Calcutta getting hold of a fledging young nestling of the Darter or Snake- bird, which was brought to the market for sale half-reared. It was charmingly tame, but the head, at the end of its long slender neck, wobbled most provokingly when I tried to feed it, so that, eager though it was for the fish I offered, it was a © dificult matter to get one placed in its mouth. The obvious move that suggested itself was of course to hold the wobbling head in one’s hand to steady it; and to my intense surprise, as soon as I did this, the bird’s mouth suddenly expanded to about twice its previous size, so that it looked like a funnel. Obviously the clasp of my hand reproduced the pressure of the parent’s gullet, to which the nestling instinctively responded. Since then | have read an interesting note by Miss R. Alderson, a keen amateur of Doves, about her difficulties in getting food into the mouth of a very young Dove-nestling she was rearing, until its beak happened to slip between her fingers, when it opened it at once, and was thereafter fed quite easily; evidently in this case a little pressure to represent the feel of the parent’s bill was all that was needed. SPOILT CUCKOO CHILDREN 119 The method of putting the beak and often a good deal more, as we have seen, inside the parent’s mouth, is, however, not the usual one with nestlings which are fed by the parents; the more popular method is for the young to gape and the parents to place the food in their open beaks, whether they disgorge it or bring it in morsels. ‘This may be seen in the case of Canaries, Sparrows, and small birds generally, to say nothing of less familiar — creatures like Hawks, Owls, Kingfishers, Rollers, etc. Nightjars grip the bill of their parent with their own, and young Storks, judging from the ‘ behaviour of specimens which are reared now and then at the Zoo, expect the old birds to throw up the food into the nest, when they pick it up and swallow it—a most insanitary-looking proceeding. Generally speaking, nestling birds have no idea of picking anything up till they are nearly fledged, sometimes not till after they can fly, and would starve in the midst of plenty through not dreaming of stooping to pick up their food. Cuckoos are particularly slow in learning to pick up food, and in nature seem to be thoroughly spoilt by their foster-parents. ‘They are especially ravenous, and this applies to the non-parasitic ‘* Crow-Pheasant ”’ of India, as well as to the parasitic species. Even among our few domesticated birds we are well acquainted with two different types of young, which may be conveniently called active and passive, the “‘nidifugous”? and “ nidicolous” young of ornithologists; the latter, about which I have 120 BIRD. BEHAVIOUR been speaking above, being exemplified by the “nestling ’’ young of Canaries, Budgerigars, Doves, and Pigeons, while our ordinary poultry, with their active running or swimming chicks, exemplify the former. 7 When we study the bird class family by family, we shall find that the cleavage between these two types of nestlings is very definite and complete ; that is to say, they never both occur in the same family. All young Pigeons, so far as 1s known, are as helpless as those of the common Pigeon, even in the case of those Ground-Doves found in America and Australia which so closely resemble Partridges in general habits ; and all young of the Duck family, from the grazing Geese to the fishing Mergansers, are as well able to “paddle their own canoe” as the familiar domestic duckling. The two types crop up independently, moreover, in very distinct families; no one would think of classing Pigeons and Hawks together because they both have helpless young and feed them, or putting Fowls and Ducks in the same group because in both cases the young are active and more or less inde- pendent. It will be seen that the two types of young have no relation to the general habits of the parents, whether carnivorous or vegetarian, terres- trial or aquatic; the production of one or the other type may be regarded as a minor habit, generally connected with the style of nest or nesting-site used. ‘Thus, birds which have a well- developed perching foot, such as Pigeons, Herons, PASSIVE AND ACTIVE YOUNG §121 Cormorants, and Parrots, to say nothing of the numerous tribe of Passerines, generally build above ground on bushes, trees, or rocks; and such will naturally enough have helpless young ; those which have the foot only formed for running or swimming, and the hind-toe very small or absent, are naturally less apt to perch, build on the ground as a rule, and have young which are active runners or swimmers. It thus becomes possible in most cases to predict the probable nature of a previously unknown bird’s young by the structure of the adult’s foot; but such detective-story methods in natural history are to be employed with great caution, and in the present case, as might be expected, exceptions occur. To take the flightless birds, for instance, the rule works out all right with the flightless runners, from Ostrich to Apteryx, all of which have non- grasping feet with the hind-toe absent in all but the last ; but it fails when we turn to the Penguins, which have a dwarfed useless hind-toe, even situated on the inner side of the foot, and yet have young which are helpless nestlings, in spite of the labour thus entailed on the flightless parents in trudging to and from the sea to get supplies for them, a labour in which the male is as earnest as the hen. Among the flying birds, too, we find that in the Petrels, which are by no means perchers, having the hind toe reduced to a nail, and breed more often in holes in the ground than anywhere else, that the young are helpless and fed with an oily substance disgorged into their mouths by the parents. - 122 BIRD BEHAVIOUR Then on the other side, there is at least one family of tree-haunting and high-nesting birds which has active young, that of the Curassows and Guans (Cracid@g), perching game-birds with gripping feet, which take the place of Pheasants and their kin in the forests of the warm parts of America. The chicks here are fed by the parent for a day or so at any rate, judging from the behaviour of captive specimens, and they are hatched with the wing- feathers as well developed as in a chicken a fortnight old; it seems that they follow the parents along the boughs and creeping vines—so I was told by a naturalist, who said the chicks could be caught by shaking them down; no doubt this is one reason why so many of these birds are so extraordinarily tame in captivity; they have presumably been hand-reared after such a method of capture. Some of the typical game-birds, for instance the Javan Peacock (Pavo muticus), the Tragopans, and also the Argus, have the quills well developed at birth, so that there is not such a great gap between more ordinary game-birds and the young of the Megapodes or Mound-builders, which are hatched with wings quite full-fledged and fit for immediate flight, though the body is downy. ‘These represent the extreme of precocity in modern birds, and are the most independent of all young ones, since the parents take no trouble about them at all, as, being able both to feed and to fly, as well as to run, all they need to gain is experience and size in order to be as good as any adult. WINGS FIRST TO FEATHER 123 The Game-birds, then, typify one method of fledging, which is found among few others than them, that of the wings developing long before jeitrest of the plumage. Even our ‘domestic chickens show this well, although not “ able to fly in a few hours,” as a much-respected authority stated. Chicks of this type pick up most of their food, though the hen often draws their attention to it; young Peafowl and Turkeys do not begin to feed for a longer period after hatching than Fowls, a peculiarity which is no doubt the reason why poultry-keepers stigmatize T'urkey-chicks as stupid, and needing to be ‘‘ taught to peck ”— the real reason being that the yolk in the intestines at the time of hatching lasts them longer than it does Fowl-chicks, though even these need nothing for the first twenty-four hours. Besides the Game-birds, Hemipodes, and Tina- mous, the Rhea and the common Cape Penguin (Spheniscus demersus) exhibit the peculiarity of fledging first on the wings. At the other extreme of precocity comes the Fowl’s domestic companion, the Duck; ducklings are even more lively than chickens, need less brooding and for a shorter period, and are more enterprising in foraging for food, on land as well as in what is popularly regarded as their only proper element. In fact, a poultry-breeder once complained to me that ducklings of the Indian Runner breed simply ran away from the old hens who were acting as foster-mothers, who could not keep up with them, f 124 « BIRD BEHAVIOUR young ducklings being notoriously insubordinate, at any rate to hens, though they will listen to a Duck mother if she calls to them. But in spite of their independence, which is greater than that of any young birds other than the Megapodes, the fledging of young Ducks is most curiously slow. They grow and grow, and lose all their chubby infantile prettiness, and get more than half as big as their parents before any feathers come at all; and even when these do appear—on the shoulders first, and then the sides of the breast— the wings remain very tiny, out of all proportion to the powerful legs, and do not enlarge and sprout quills till the bird is full-feathered almost every- where else and is nearly full-sized; this is the stage when the birds are known as flappers. Geese and Swans also develop in exactly the same way. Some other water- or marsh-birds show a similar slowness in growing feathers to replace the down, and in the enlargement and quill-growth of the wings; these are the Rails—as any one can see in the case of the young of the common Moorhen and Coot—the Cranes and the Grebes. Young Grebes have a special remarkable peculiarity of their own in fledging; the head-feathering ‘‘ hangs fire’? longest of all the plumage, so that a Grebe may be full-winged and downy-headed at the same time, a very rare case among birds, though a similar one is found among the young of the Cranes. So far as is known, this retarded fledging, like the - precocious fledging, runs through the family wher- EVEN GROWTH OF FEATHERS © 125 ever it occurs; it will be noticed that except in the case of the Penguin, these methods of fledging are only found in families which have active chicks. The third method of fledging is that which occurs in the vast majority of birds, and is what one would have reasonably expected in all of them ; that is to say, the feathers grow pretty evenly all over the body, and the wings develop in size like the legs, and grow their quills pretty nearly as quickly as the body-feathers, and much more so than the tail, which goes ahead in the case of the retarded fledgers of the Duck and Rail type; our Pigeons, Doves, Canaries, and Budgerigars furnish familiar examples of this, as well as such wild birds as ‘Thrushes, Sparrows, etc. But these are all birds with helpless young; and the uniform method of fledging, being so prevalent, is also found among birds whose chicks are active, such as Plovers and Gulls. Some people, indeed, regard the young Gull as intermediate between the active and passive type of young bird; but as it is able to walk about, even when quite small, and can pick up the food the parent vomits for it, even if it does not provide for itself, it can fairly claim to be put on the active list. It is, however, often hatched in a nest which puts pedestrian exercise out of the question, as _ when this is on a ledge of a cliff, and so there is certainly a tendency in young Gulls to degenerate towards the passive type. ‘This is so also with their diving relatives the Auks, but even these, cliff- 126 BIRD BEHAVIOUR dwellers though they are, can walk, and pick up fish, etc., where brought by the parents—which do not swallow and vomit it, but carry it in the bill —and in the case of the Guillemot, at any rate, go down to the sea when half-fledged, their fledging being uniform as in Gulls, though this premature jump into existence results in the death of many. The young of that most curious bird the Cariama (Cariama cristata) also seems to show a partially degenerate type. It lies quietly in the nest, which is built aloft, though the old birds spend most of the time on the ground, but yet has patterned down, dark brown with a cream streak down each side of the back and cream spots upon the brown ; and as such down is usually found in runners, it presents to the eye a queer blend of the two types of young; but the young one I observed, bred at the Zoo, left the nest long before it could possibly fly, though perhaps this was premature. At any rate it climbed back to it when a bough was placed _as a ladder, so the same thing may occur in nature, the nest being in a tree; it did not seek for food, but waited till the old birds gave it, just as Moor- hens and Coots do when they are very young; and they keep taking it from the parents at times even when fledged, as this young Cariama did, and thus show, on their part also, signs of pauper degeneracy. In fact, the feeble, whining squeak and imploring - attitudes of the young of the Rail tribe contrast very unfavourably with the liveliness of their frequent companions, the ducklings; in the case ENTERPRISING DUCKLINGS 127 of the New Zealand Weka Rail, the parents, which are flightless ground-birds, have been seen running to and fro until quite weary, plying with food their young which they had left in a place of safety. Grebes, again, nursed on the parent’s back and fed there or on the nest for a week or so, come very near being mere nestlings, and are very feeble at first, unable to do more than crawl, and un- willing to swim; and the Swans’ cygnets are not nearly so active on land as goslings and ducklings, though downy and swimming well enough; and as their parents carry them on their backs, at any rate at times, and do something to feed them—the Mute Swan, as is well known, pulling up weeds for them, while the Black Swan, as I have seen, will pull them grass from the bank—these young also seem to approach nearer the nest-fostered type than the active majority of the family. Indeed, the young of several members of this group are much more active and enterprising than their parents; young Mallard frequently dive for food like young ‘Tufted Ducks and Pochards, even up to the flapper-stage, though adults very seldom do so, and they are also very much more active on land ; young Sheldrakes of three species that I have watched, the Common (Ladorna vulpanser), Ruddy (Casarca rutila), and New Zealand (C. variegata), dive most freely for food during the first week or two, while I have never seen the adults of any of these species do this, while they readily turn tail-up in the usual Duck manner, although in the ordinary a 128 BIRD BEHAVIOUR way they are more land-feeders than Ducks gener- ally. So are common Wigeon; and I have seen their young ducklings dive for food, but, curiously enough, not Mandarin ducklings, though the old birds will dive for food more readily than any other surface-feeding Duck—indeed, I have seen them do so more freely than at least two of the diving Ducks—the Rosy-billed (Metopiana peposaca) and Red-crested Pochard (Netta rufina). What habits the young of the curious Magpie- Goose may have do not seem to have been recorded ; it would be interesting to know if they fledge late like the rest of the family. Flamingoes, by the way, show a distinct difference from the Ducks in this respect; they fledge early and gradually, the wing quills developing in good time, just like the young of Storks and Ibises, to which, as I said above, they appear really to be allied. ‘Their young are fed with-disgorged food from the beak, at any rate at first, just as in these members of wading groups. Quite the most curious instance of parental aid given to active young birds is that of the Wood- cock, which carries its young from the dry wood in which they are hatched to the moist feeding- grounds, gripping them between the legs, which are in this bird very short for a wader, not longer, in fact, than a Partridge’s. Even when the young ~ are so far advanced towards maturity as to be bigger than a Snipe, the habit is kept up. Another instance of active young being carried RESISTANCE TO INJURY 129 in the parent’s feet is that of the young of a very common Eastern water-fowl, the Small Whistling Tree-Duck (Dendrocycna javanica), which commonly breeds in trees, and has been seen to bring the young ducklings down in that way. The tree- breeding habit occurs frequently in Ducks, espe- cially in tropical climates, and our Wild Duck frequently breeds in pollard willows or on decayed stumps, but the young in such cases generally jump down and take their chance, though M. Rogeron records one case in which he saw the old bird carry down the young in her bill, as the American Wood-Duck or Carolina Duck (4x sponsa) is said to do. I have heard, however, of a case in which the nearly related Mandarin Duck, breeding at large on an English estate, nested in a hole about fifty feet above a hard carriage drive, and the young simply jumped down and sprinted off for the water; of course young Ducks are very light, and thickly padded with stiff down, and so can take risks of the kind better than might be supposed. But the power of resistance of even adult birds of such a kind to a fall must be great; I have known an adult Carolina Duck escape from the former zoological sale-collection on the terrace at Covent Garden and fall (being pinioned) on the hard stones beneath, and yet not be injured. A curious instance of a young bird of the active type in appearance being nevertheless a nestling in habits is that of the young of the South American 9 ee BIRD BEHAVIOUR Sun-Bittern (Zurypyga helias) which bred in the London Zoo at the zenith of that institution, when it was under the Sclater and Bartlett management, and really excellent results were got there. This bird is described as being like a young Woodcock - or Snipe in appearance, with variegated down, and it did not gape or cry like young birds generally, but when the parents flew on to the nest, which was at the top of a pole, with a small fish or other food in their bills, it snapped or pecked. the morsel from them and devoured it. The Sun-Bittern is not well-named, for, in spite of its carnivorous and wading habits, it is not at all like a Bittern, and forms a family of its own, related to the Rails; evidently it is a bird whose young are degenerating into the nestling type. Within this type are to be found, as will be in- ferred from what has been said, varying degrees of degeneracy ; young birds of prey, for instance, can seize with their feet and tear up food before they are out of the down. They will even walk about a little, if their surroundings permit, while in this stage, and so will young Penguins and even Pelicans, though in the case of the latter there is often little chance, as these birds as often as not nest on trees. Young Nightjars are also quite able to run, and do so for short distances. Young Larks may be perhaps returning to an active condition, as they will ramble away from the nest before fledging; Mr. W. Farren has amusingly described in a recent number of Wild NON-SLIP PADS FOR NESTLINGS 131 Life how young Woodlarks venture away for a few feet from the nest when alone and undisturbed, and then, when frightened, shrink back to it, as if attached to: invisible strings of elastic which pulled them back by contraction. This tendency to “reverse engines”’ is very marked among many nestlings, and is no doubt connected partly with the habit of backing to the edge or opening of the nest in order to discharge their dung, a piece of instinctive sanitation, and with retirement on alarm without turning round. It is particularly well marked in young King- fishers, which run backwards in a most comical way. ‘They are provided with a pad on the hock- joint, on which they rest, like so many young birds, in repose; but it is not nearly so well developed in them as in young Woodpeckers and Barbets, which have a very marked horny-studded heel- cap, and, as nestlings, do not move on their toes at all, but on the heels, as I was, I believe, the first to record, having reared the Indian Gold-backed Woodpecker (Brachypternus aurantius) and two In- dian Barbets—the Blue-throated (Cyanops asiatica) and the Crimson-breasted (Xantholema hema- tocephala)—from the nest, and so noted not only the occurrence of the heel-pad (which had been previously observed in the Wryneck), but also its function.. Such a pad has since been observed by Mr. Seth-Smith in the young of a Toucanet (Selent- dera maculirostris). These young Barbets, by the way, had a pecu- 132 BIRD BEHAVIOUR liarity I never observed in any other nestlings: they kept their tails turned over on their backs, and under their closed wings; a most admirable ar- rangement for the tight packing which is the lot of nestlings reared in holes hacked out in trees, as young Barbets are, but nevertheless young Wc peckers have not the habit, though similarly placed. The nestling most celebrated for its peculiarities is that of the Hoatzin (Optsthocomus hoazin) of the forests along the edge of some rivers in northern South America. The adult bird is not unlike a perching Pheasant in general form, size, and habits, but the young are most curious creatures, clad at first in a scanty down like that of a young Pigeon, but nevertheless born open-eyed, not blind as Pigeons and other naked or nearly naked nestlings are; they are also able to clamber about the boughs, in which action not only the bill and feet are brought into play, but also the wings, which have claws at the end of the first and second digits, the first digit in birds being that little movable point which supports the set of pigmy quills known as the bastard-wing, which may be seen projecting at the pinion-joint of a Pigeon’s wing when it is about to settle, and the second forming the tip of the pinion. These claws of course represent two of the three original claws found in the separate digits of the primeval birds’ forelimb (which were probably simply enclosed in a common skin like a Kingfisher’s toes), and so it is interesting to find them still in YOUNG HOATZIN, A half-fledged specimen, showing its 132 method of climbing with bill, wings, and feet. - ee TURKEY. b BRUSH gest of the mound and the only one commonly seen q a irds, ivity. capt f the lar is one O 1S ata t ing gai and has the strutt ? fa Thrush 1Ze€ O about the s of a Bantam cock ite, is brown and wh ird b “The Oven WING-CLAWS FOR CLIMBING _ 133 use in a modern bird, if only during youth, for as the bird gets older and fledges, which it does in the usual uniform way, the claws are shed. This is curious, because in the Ostrich, which is ages away from any perching or climbing ancestor, being not only flightless but having lost not only the gripping hind toe but also the one next to it, the wing- claws are retained throughout life. The peculiarity of the young Hoatzin is not so unique as might appear, for the young of the Touracous (Musophagidg), with which it used formerly to be classed, also pull themselves about their nests with their wings, as was first pointed out by Sir Harry Johnston, and confirmed by Mrs. Johnstone from observation on a specimen bred in her aviary. Young Moorhens and Porphyrios also use their downy wings (which have a claw on the first finger) in scrambling about, and young Grebes—at any rate young Dabchicks—can during the first week or so of their lives only get about in this way on land, or rather on the nest, which is all the land they know. The really most interesting point about the Hoatzin, then, would appear to be that it is apparently a link between the nestling and the chick types of young, having the imperfect clothing so common in the former and the active habits of the latter, though we are not told if it feeds itself at all. So distinct is the separation between the two types that there is only one case in which the 134 BIRD BEHAVIOUR. young of one family differ in type from those of another nearly allied to it; this being that of the young of the Sand-Grouse (Pieroclide) which are active runners, though with a very different type of down from that of young game-birds proper, it being more like true feathers. Yet the Sand+Grouse are supposed to be allied to the Pigeons, in which the young present the consummation of the help- less type, blind and pap-fed, with the down nearly always scanty, and sometimes even wanting, as in the bare black young of the Nicobar Pigeon (Calenas nicobarica), which reminds one of a new-hatched Cormorant, Cormorants and Gannets being bare at first and downy later on. But the Plovers are also a related group, and these the Sand-Grouse approach in their aborted hind toes, in their flight and notes, and in laying spotted eggs on the bare ground, as much as they do the Pigeons in their short legs and vege- tarian habits. Those Pigeons also which have adopted a ground life and assumed a coloration strikingly like that of Sand-Grouse, nevertheless do not resemble them more than other Pigeons other- wise, so that possibly the Sand-Grouse are not so near Pigeons as some anatomists have made out. There is only one family of birds in which the young are not definitely known, and that is the extraordinary little group of Finfoots (Heliornz- thide@), of which only three species are known, all from warm climates, one African, one East Indian, and one South American. In appearance and INFANTILE UGLINESS 135 habits they are a strange blend of Rail and Cor-~ morant, and all we know about their young is that Prince Maximilian of Wied once shot a male of the South American species (Heliornis fulica) carrying two naked young under its wings. A male Dabchick might have been doing this, but the queer thing about the Finfoot’s young is that they should have been naked, since such young always remain in the nest; further information is certainly much to be desired, but the Asiatic bird seems everywhere rare, and nobody has taken much trouble about the African and American species, though both have been kept in captivity, one of the former having even been brought to England by Mr. J. D. Hamlyn. Besides the inactivity of passive nestlings, the absence or very slight development of down in many of them is very striking, and their extremely repulsive appearance when thus clad, or rather unclad, makes it easier to understand the descent of birds from such an unpopular class as reptiles. “The young at first are perfectly bare and very hateful,” is the remark of Russ on the young of a little Finch, as quaintly translated by Dr. Butler in his book on foreign cage-birds. But there are gradations of this in the same family ; for instance, among the Passerines, the young Lyre-bird is well clothed with down, and Mr. W. Frost tells me that he finds the young of the pretty ‘Thrush-like Pittas, at any rate the Aru Islands species, are so as well; Canaries and Robins have a little down, but Sparrows and Crows none. 136 BIRD BEHAVIOUR Among Parrots, young Cockatiels and Keas have down, but Budgerigars and Ring-necked Parrakeets are bare. So, apparently, are all Kingfishers, Rollers, Woodpeckers, and Bee-eaters, but Hoopoes boast of ‘‘a little bit of fluff,” though Hornbills are naked. Nightjars are downy, and so are Owls and Hawks, the down of Owls being in most cases in two crops, the first one white, like that of most young Hawks, while the second one is coloured and often barred. Curiously enough the young of the Snowy Owl is black, like that of the White Tern (Gygis), and the goslings of the Snow-Goose are very sooty-looking little things—at least hybrids between the white and blue-grey forms are. Among the Geese, uniform though their life- habits are, all being big strong wary birds, living in the open, able to swim, and feeding on vegetable food, there is a remarkable variety of down-colour and pattern in the young. Some are nearly self- coloured, olive ranging into yellow, as in the case of the common Grey Goose (goslings are only all yellow when the offspring of a white tame Goose, just as ali yellow ducklings are the offspring of tame Ducks), or into black, as in the Snow-Goose; and some have a strong contrasted pattern, dark over most of the upper part and white below, as in the Bernicle, while in the highly specialized Cereopsis the goslings are striped light and dark. Generally speaking, however, patterned down— striped, pied, marbled, or spotted—is characteristic of active chicks, while the passive nestlings, when SELF-COLOURS AND STRIPES 137 they have down at all, have it self-coloured, usually black, white, grey, or buff. There is an interesting exception, however, in the case of the Osprey among birds of prey, whose helpless young have variegated down, although in such birds the down is generally white. Among the birds with active young, too, there are conversely groups or species which have self-coloured down; young Rails are black, young Cranes tawny, or, in the case of the splendid Stanley Crane of South Africa (Letrapteryx paradisea), grey, and cygnets grey or white. And among the Game-birds, which so generally have striped down, that of the young chicks of the desert Seesee Partridge (Ammo- perdix bonhamt) is plain buff; and so is that of Hemprich’s Gull (Larus hempricht), which breeds on the scorching rocks of the Red Sea. Taken into consideration with the fact that the young of the common Fowl, which are naturally strongly striped, as may be seen in the young of such breeds as the Brown Leghorn, which are coloured like the original Jungle-Fowl, generally appear in buff, black, yellow, or grey down, the conclusion seems at first irresistible that in the case of patterned chicks the pattern is necessary for pro- tection, and that where security does not depend on coloration, it tends to disappear. ‘Thus, the Cranes and Swans are strong birds and can protect their young and the Rails are clever skulkers and never go far from cover, so that the young of these may have lost the pattern just as nestling birds 138 BIRD BEHAVIOUR have, it having become unimportant. The sandy young of the Partridge and Gull above mentioned might be cited as important confirmatory evidence, their exceptional plain colouring being in this case just what was wanted for protection. It is also well known that the chicks of most ground-birds instinctively crouch when alarmed, after the fashion of most assimilatively coloured creatures. But on the other hand there are several cases in which birds of similar habitats have widely different down-coloration, and the reverse; some have been mentioned in the case of the Geese, and among the Ducks we find that the young of the Tufted Duck and Pochard, very similar in habits and diving power, and breeding on the same waters, are very different in the down, the young Pochards being patterned, very like the young of the surface-feeding Mallard, and the young Tufted nearly all black. Conversely, the ducklings of Mallard and Muscovy Ducks are both patterned in black and yellow, and yet the former never breeds in the tropics in a wild state and the latter is essentially a bird of the hot zone of America, so that their environments must differ much more than those of the Pochard and Tufted Duck. Emus are more strongly striped in the down than any other young birds except Grebes, and one could hardly have birds more widely separated in habits, Emus being almost the biggest of land runners, and Grebes the most aquatic of all birds, and of moderate or even small size. = FUR-LIKE BABY-CLOTHES 139 In any case, it will be noticed that the down of young birds resembles the fur of beasts in colour- ing, just as it does in texture, though the latter resemblance is of course superficial, down being merely a specialized form of feathers. No adult birds are longitudinally striped to the extent that chicks often are, but such a marking is not uncom- mon in beasts, such as the striped squirrels of Asia and America, and the striped mice of Africa, to say nothing of the striped young of most of the wild pigs. The marbling of certain chicks, and the spotting of others, may be compared with the varied coats of cats and civets, and, most interesting of all, it will be seen that chicks exhibit no colour which is not found in mammalian fur, however brilliant their feathers may be when they grow up. Black, white, and grey, chestnut, brown, and buff, are almost all their tints, and the only bright one they show, yellow, is just that which is permitted to beasts ; visitors to the Zoo will recall the yellow beard of the Mandrill and the yellow whiskers of the Moustache Monkey (Cercopithecus cephus), to say nothing of the self-yellow coat of the Lion Mar- moset (Midas rosalia) which surpasses that of any duckling. Several weasels also boast of yellow throats and breasts, and squirrels almost rival the gayest monkeys in brilliancy of tint. Moreover, young birds, like mammals, may dis- play other bright colours if these are limited to the skin, or at any rate to featherless parts. The red on the head of young Coots and Grebes may be 140 BIRD BEHAVIOUR compared to that on the Mandrill’s Bardolphian nose, and the young of the Indian Paddy-bird (Ardeola grayi), a very near relative of the Squacco Heron of our British list, display among their tufts of long hairy-looking down a skin of as lively a green as any monkey can show in uncovered portions. It may happen that young birds are far prettier than their parents, as in the case of the charmingly striped and red-capped young Grebes; in this case they remind one of reptiles, in which the young are generally very much more beautifully and distinctly marked than the old, a contrast which is especially marked in the case of crocodiles and tortoises, which are quite handsome when young, though so parti- cularly dull when adult; and every naturalist must have noticed the pretty silver-and-black young of the plain-coloured slow-worm (Anguts fragilis), and the rich sharp tints of young snakes. According to their reptilian descent, young birds must at first have been active and variegated, and tended to degenerate into uniform down or even | nakedness, as they departed further from the ancestral type. The flying, independent young of the Mound-builders, hatched as they are without incubation, ought to be primitive, but they are said to have a suit of down which they cast in the shell, and at any rate they are not striped, a fact which militates against the utility of striping for protection, since they particularly ought to need it, not having any parental care exercised on their behalf, but shifting for themselves from the first THE REAL BIRD’S-EYE VIEW 141 like young reptiles. Also, if striping is so protective, why are striped small animals, although not absolute rarities, so infinitely in a minority compared to the plain brown ones? And why are the pestiferous skunks and zorillas, armed with their fetid secre- tions, striped like the young Emus and the Cereopsts goslings ? The fact is, we shall not know anything certain about the meaning of colouring in relation to pro- tection until our airmen have a chance to take to animal observation, and give us the real bird’s-eye view, since some of the worst enemies of all small life must be the birds of prey, which are common in all countries where man has not killed them off to protect his poultry. Beasts and reptiles, of ' course, do their share of destruction, but the former mostly hunt by scent, and the latter depend much on seeing their prey move, when no colour is of any use. Although they present such great diversity in the habits and care of their young, as opposed to reptiles in which these are always active and inde- pendent, birds, as every one knows, are as uniform in their production of young as in their possession of plumage, since they all lay eggs, and eggs with a hard shell at that, unlike the parchment-coated eggs of most reptiles. But they greatly differ from reptiles in the great diversity of the colour of these eggs, which is of course the reason for the great popularity of birds’-egg-collecting. Nevertheless, many groups have kept up the 142 BIRD BEHAVIOUR reptilian custom of laying plain white eggs—or at all events very faintly tinted ones. Penguins, Grebes, Pigeons, Owls, Woodpeckers, Barbets, ‘Tou- cans, Bee-eaters, Rollers, Swifts, Hornbills, King- fishers, and Humming-birds all lay white eggs, and although most of these lay their eggs in holes, a great number do not, notably all the Humming- birds and nearly all the Pigeons, our common Blue-rock and the Stock-Dove being quite excep- tional in the family in their habit of breeding under cover. The eggs of the Duck tribe also are always light-coloured and unspotted if not actually white, though in this case it must be admitted that the birds always cover them when leaving the nest, as do some of the Game-birds, like the Partridge. On the whole it would seem that birds which lay white eggs simply do so because they are physically incapable of laying eggs of any other colour. With regard to the numerous spotted eggs, it may be freely admitted that when laid on the bare ground, as by Plovers, they are often really hard to find, and that here protective resemblance — probably does come into play; but in the case of the often bright-coloured and beautifully-variegated eggs of passerine birds, generally deposited in open nests in trees and bushes, the colour does not seem to be of any great importance, the great point being that the nest should be concealed. If such ~ eggs were coloured to assimilate to the foliage, we might expect some green ones, but in practice there are no truly leaf-green eggs except those of GEMS IN PLAIN CASKETS 143 the Cassowaries, which are just like big unripe plums, and are of course laid on the ground. And as a matter of fact, eggs of any sort are practically never of a pure colour, either in ground or markings ; blue-greens, green-blues, brown-reds, and yellow- buffs are the usual tints, but no egg is azure-blue, scarlet-red, or gamboge-yellow, or even magenta or violet. The most richly coloured egos are those of the Tinamous (Zinamide), which have a glaze like china and are self-coloured, exhibiting such tints as sea-green and plum-purple, though they soon fade when blown. The Tinamous themselves are one of the plainest-coloured families of birds in existence, not one species having any bright or conspicuous marking, and only a few even such little decorations as a red bill or yellow legs; and it will be noticed that taking the class of birds as a whole, a beautiful bird never lays a beautiful egg, and vice versa. ‘The music of the moon sleeps in the plain eggs of the nightingale,” says the poet, and the glories of the Peacock’s rainbow train and the Golden Pheasant’s glowing crest and blood-red breast are packed into eggs of a simple cream- colour, while in the same family the sombre Grouse and Quail lay quite richly mottled eggs. One of the most curious coincidences among birds is to be found in the markings of the eggs of many birds of prey, which are just like dried blood, foreshadowing the little murderers which will break through their shells; a believer in ma- 144 BIRD BEHAVIOUR ternal impressions would tell us that this is just what one might expect, but the white eggs of the equally sanguinary Owls would confute him. But the existence of such meaningless coincidences should make us careful in assigning a survival value to every modification of form and colour in either bird or egg; the subconical shape of the Guille- mot’s egg, for instance, certainly renders it less likely to roll off the ledge on which it is laid, but then one parent bird or the other is always on it, and the peg-top shape of the eggs of Plovers and shore-birds, although it facilitates packing in the cross-shaped arrangement, points all inwards, which the sitting bird affects for them, may be merely incidental and not specially evolved. Sometimes there seems to be no reason whatever for the peculiarities of an egg; why, for instance, should the curious Pink-headed Duck of India (Rhodonessa caryophyllacea) lay, in an ordinary Duck- nest, eggs which in colour, gloss, and roundness remind one of a set of billiard-balls ? Then as to markings and tint, no reason has been given why the Guillemot should lay eggs so extraordinarily variable in these respects, or why birds which lay coloured or variegated eggs should, generally speak- ing, exhibit so much difference in their output, as compared with the uniformity of their plumage. Broadly speaking, one may expect in any species — laying a variegated egg specimens lightly and heavily spotted, and others with fairly evenly distributed markings contrasting with some in AN ORIGINAL GUILLEMOT 145 which the colouring tends to concentrate in a belt or cap, almost invariably at the large end— phenomena which are well exhibited in the common Sparrow. No other bird is anything like so variable in its egg-coloration as the Guillemots, but some are very far from being even ordinarily true. to type, as the Red-backed Shrike with its olive and red types, some Indian Warblers with their blues and reds, and some of the African Weavers with their self-blues, spotted blues, and whites. Individual birds, however, tend to reproduce the _ game type of egg; there is an historical instance of a Guillemot which laid on a particular rock-shelf an egg of the rare and valuable red variety which was duly taken for fifteen years on end—though of course this might have been the produce of another bird with the same peculiarity. Yet on the other hand, all the eggs in a laying may not match; the Tree-Sparrow is notorious for having one differently marked egg in every set, and the Golden Eagle commonly lays one variegated egg and one plain one. It is said, also, that in the case of birds which lay richly coloured eggs, the coloration varies as the bird advances in years, which is, after all, rather what one might expect. The colour is in any case laid on almost like paint, and will smear if the egg be washed when new-laid; while in the case of the eggs of many es Shore. birds (Charadriide), Gulls, Rails, and song-birds especially—it will be noved chat there are often two sets of spots, one of which 10 146 BIRD BEHAVIOUR has been laid on before the shell is complete and so lies deeper and looks fainter, such under-surface — spots being grey, lilac, or mauve in colour. In the eggs of Cormorants and their kin (Szegano- podes), Grebes, and some of the non-parasitic American Cuckoos (Crotophaga, Guira) there is a chalky layer external to the real shell, which is often blue, and shows here and there. In the case of the Cuckoo Guira, the “ White Ani,” the effect is exceedingly pretty, the rich blue shell being plenti- fully flecked, but not obscured, by, the chalky secretion. Grebes’ eggs, by being covered by the owners with some of the sodden weed of which the nest is made, soon get stained and are generally seen as buff or brown objects, though the proper and original colour is white; Ducks’ eggs are naturally greasy on the surface. The egg of the Fulmar is distinguishable by the nose, having the same strong smell as characterizes every part of its producer, even to one feather. The surface of birds’ eggs generally varies a good deal, from a rough one like unglazed porcelain to the glazed type best shown in the Tinamous’ eggs ; but Kingfishers and Owls also lay very glossy eggs, and Ostriches’ eggs are both glossy and pitted. The shell gets duller and more brittle as the eggs are sat upon in the case of birds generally. The number of the sitting varies in a very inter- esting way ; in quite a number of birds it is at the minimum, the egg being single. This is the case with Petrels and Albatrosses, the Gannets, the A LOVE OF ODD NUMBERS 147 American Vultures, the Lammergeier, the Sun- Bittern, the White Noddy (Gygis), the Crab-Plover (Dromas ardeola), and many Auks, Penguins, Hum- ming-birds, and Pigeons. Most Pigeons and Hum- ming-birds, however, lay two eggs, as do some of the diving sea-fowl just mentioned. Four is the ordinary number with the shore- birds—Plovers, Sandpipers, and so forth—and it is only among these that a larger set than one or two Is constant; as a general rule when twins are exceeded, “‘ several’ is the only numerical expres- sion which can be used to describe the hatch. Birds which do not lay two or four eggs seem, however, often to think that there is luck in odd numbers, for three, five, and seven are frequent numbers. _There is a widespread tendency, as that very acute observer, Mr. E. C. Stuart Baker, has pointed out, to over-rate the number of eggs laid by the Game-birds and Ducks; these are really not so much more prolific than the birds nursing helpless young in nests as is supposed, at any rate in the East. The wild Hen oftener lays six eggs than a dozen, and this will be a reasonable brood for many Ducks ; the Australian Musk-Duck (Biziura lobata) only lays three eggs. It would appear, however, that in Europe most birds, Passerines included, are more prolific than in the Tropics. The eggs of birds which have active young are credited with being bigger than those from which passive nestlings are excluded, as well as more 148 BIRD BEHAVIOUR numerous; and certainly the largest eggs propor- tionately to the parent come from species with this habit. The Guillemot, for instance, whose young is as active as existence on a narrow shelf of rock admits, lays an enormous egg, and this is surpassed by the Kiwi, whose egg is so large that it is difficult to see where the bird’s internal organs go while it is being carried, and the male bird, which alone incubates, cannot cover it properly, but has to lie across it. The Jack-Snipe, too, accomplishes something like a record in laying four eggs so big that they average over the inch in their widest diameter, while the bird is not bigger than a Lark. The Raven, on the other hand, is remarkable, even among nestling-fosterers, for the small size of its eggs, which are hardly bigger than those of the Carrion Crow, a bird hardly more than half its size and of similar general habits. ‘The Wren, true to its original and self-assertive character, lays .a large sitting of relatively large eggs for its size. It will be noted, however, that very small birds do not lay the tiny eggs one might expect; those of Humming-birds, for instance, though among them may naturally be found the smallest of all eggs, are not proportionately so minute as one might have supposed. There is evidently a limit to the smallness of eges; an experienced poultry-fancier told me not long ago that this was the obstacle which faced the bantam-breeder, for whenever an exceptionally tiny pullet was reared, she was certain to succumb HENS WITH ONE CHICKEN 149 sooner or later at the attempted laying of her first egg, the egg not being reduced proportionately to the size of the hen. Something of this sort may have operated to prevent Humming-birds becoming as small as blue-bottles—the actually smallest species, Calypte helene of Cuba, being just about as big as a queen humble-bee, though I doubt if it is as light as Mellisuga minima, which used, as its name implies, to be considered the smallest of birds. The Storm-Petrel, smallest of web-footed fowl, certainly lays a very large egg for its size, although the young is helpless; it is not larger than a Swal- low, while its egg measures an inch in length, and this is not purely a matter of disproportion to reduced size, for Petrels generally lay a large egg. It is worth noticing that it is among birds which lay a single egg that the most sensationally numerous species are found; the Passenger Pigeon of America (Ectopistes migratorius), so recently extinct, whose columns used to take hours to pass a given spot, was one of the Pigeons which lay but one egg. ‘The Puffin is supposed by some to be the most numerous bird in Europe, and some of its brother Auks, like the Guillemot, are also inordinately numerous; the extinct Great Auk was wonderfully abundant in its day, as is the common Gannet still for a bird of its size, while according to Darwin, the Fulmar Petrel is said to be the most numerous bird in the world. This is very doubtful, but he might have been thinking of another Petrel, the Mutton-bird (Puffinus brevicauda), which has been seen in enor- 150 BIRD BEHAVIOUR mous masses in the South Pacific, quite equalling the old-time flocks of Passenger Pigeons. At any rate, such facts as these look as if one- egg-laying were a good habit for survival; but at the same time we must remember that the birds above quoted are conspicuous for living or at any rate breeding, in masses, thus giving a false impres- sion of their numbers as compared to more scattered species; that most of them draw their living from the hospitable storehouse of the sea, and that two of them did not stand long against human destruc- tiveness at any rate, and might not have withstood the invasion of any other carnivore. Moreover, some of the single-egg-layers are scarce birds; the Condor and Lammergeier are not nearly so common as the smaller Vultures—I only saw two of the latter during all my residence in India; and the large Hornbills, which lay only one egg, are always rare where the smaller and more prolific kinds are common. ‘There may be in some cases good reason why only one egg should be laid, as will appear in the consideration of some curious incubation and nursing habits, but it is a quite possible consideration that birds which lay only one | egg are on the decline as species through infertility, since one egg a year—and sometimes even one in two years, as is said to be the case with some of the great Vultures—is a perilously low output, and the - sea-birds are liable to numerous accidents. And as to actual numbers, it is highly probable that such birds as the Quail and Skylark, which are FERTILITY IN CAPTIVITY 151 common almost all across the Old World, are really more abundant than any bird which ever nested in close-packed colonies and flew in cloud-like - flocks. The fertility of birds laying several eggs appears to increase with age; the Swan, for instance, lays twice as many eggs when mature as she usually does when starting laying in her second year. It is true that domestic Hens decline in fertility in a year or two; but then they are expected to lay in one year twenty times as many as their wild ancestress does. Tame Ducks are more fertile; with an equally exaggerated egg-production, they lay a paying amount of eggs—at any rate in the case of the prolific Indian Runner breed—for twice as many years as a hen. Yet the Muscovy Duck, the Turkey, and the Goose have not had their fertility increased as a tule above that of wild birds. ‘These always have eggs in reserve; even if the set be only one or two, others will replace it at least once in case of accident, and birds which lay several eggs will under artificial stimulation produce numbers at times as great as an inferior domestic Hen. An unfeeling naturalist once made a Wryneck lay forty eggs in a season by removing them as fast as laid, a piece of brutality which very probably ended in sterilizing its subject, as an extreme output in one year is likely to reduce subsequent prolificacy, as one would expect. In a case I heard of in which a hen Silver Pheasant laid seventy eggs in one season, 152 BIRD BEHAVIOUR I was afterwards told that she had laid none at all the next. What may be called voluntary overlaying is rather apt, however, to occur in captive birds; the Californian Quail (Lophortyx californicus) is particularly liable to it, It may even occur in Nature; thus, a specimen of the Indian Nukta or Comb-Duck (Sarcidiornis melanonota) has been captured on a regular deposit of eggs, tier after tier, amounting to forty in number; and as she was very emaciated, and one of the eggs was very small, presumably her last, she had no doubt laid che lot.) Such cases as these, and exceptional ‘Turkey hens that lay a hundred eggs, show us how our high- laying races of Fowls and Ducks have been origin- ated; they began a long time ago, since Aristotle speaks of every-day layers. Birds may deposit their batch of eggs at the rate of one egg a day, or lay at intervals of two or more days; the rule is not constant for the same group, since the Pigeon deposits her second egg two days after laying her first, and the Collared Dove lays her pair on con- secutive days. With hens and Turkeys, too, every- day or intermittent laying varies individually. Most birds, although keeping about the nest, do not begin to sit till they have got the full number ; the rule appears to be universal among those which | have active young, since their broods all come off at once, but birds may make a mistake or get impatient, and go off with a partial brood, leaving THE FATE OF BENJAMIN 153 tardy or insufficiently incubated hatchlings to perish in the shell. Many birds which have nestling young, however, evidently begin to sit at once, since nestlings of very different ages may be found in the same nest ; this is notoriously the case with some Owls—such as the Barn-Owl—and Hawks, and it is noticeable with Budgerigars, at any rate in captivity. In such a case, the youngest member of the brood may be callow and blind, while the eldest is feathered and almost ready to fly; and in such cases it is curious that the youngest can survive at all, espe- cially in the case of birds of prey, where it must offer considerable temptation to the appetites of its nest-fellows. Indeed, a case has been recorded (“‘ Notes on Cage-birds,” ed. Greene, 2nd series) in which a brood of young Barn-Owls when shut up in a room with a supply of meat nevertheless killed and ate the Benjamin of the family, and a brood of Canaries I reared myself all hatched out on different days, the five eggs having been laid, as usual with such birds, consecutively, with the result that the youngest, which was a littre overdue and helped out by me with a pin, was fatally crushed, with the next youngest, by the other three. ‘To avoid such occurrences, it is the custom of many canary- fanciers to take away the eggs as fast as they are laid, replacing them with a nest-egg, and putting them back when the complement is complete ; but this is not always done, and the wild small birds ‘ 154 BIRD BEHAVIOUR generally get on successfully with their broods, no doubt not being tempted to sit so closely as Canaries, owing to the need of seeking food for themselves. I noticed with the Dabchicks which bred on the Indian Museum pond that they seemed to attach no value whatever to their eggs till they had the full set; the first laid were allowed to lie, con- spicuous as they were by their whiteness, uncovered in the nest, which was only among the low-growing kalmi or water-convolvulus or among thin reeds. I can only conclude that the eggs escaped the attention of the numerous House-Crows simply by the dread these worthies had of risking their pre- cious persons in the attempt to pick up an object lying practically on the surface of the water, for I found they did not dare to pick up bread thrown into the pond, although the same species of Crow down by the Hooghly picked food from the water as a matter of course. 3 When the Dabchicks began incubating, however, they were careful enough, and always covered the eges before leaving them, after the usual manner of Grebes; curiously enough, however, though they kept the nest piled up while they were brooding the young on it, they did not raise it when they had eges and these were menaced by a flood, and lost two sittings in this way in consequence. Under similar circumstances a Swan, as is well known, will raise her nest, but then she is always ready to do this, if material is within reach of her bill. I noticed that with these Dabchicks incubation - KEEPING THE EGGS COOL 155 was very largely left to the sun, or to the heat generated by the decaying weed in which the eggs lay, for they were often both off the nest at all and any times of the day; and this habit of hatch- ing otherwise than by constant incubation has been often noticed. The Black-back Courser (Pluvianus e@gyptius) of the African river-banks buries its eggs in the sand and damps them to prevent them getting too hot ; Sand-Grouse on the plains of India have been found sitting on the eggs not to warm them but to keep them cool, since under the blazing sun they actually began to cook if the birds were scared off for a little time; and the Ostrich has quite a reputation for letting the sun hatch its eggs, though this only happens in the more tropical part of its range—in South Africa it sits like any other bird. Ordinary passerine birds may even in exceptional circumstances make use of the sun as an incubating agent; in Hume’s ‘“‘ Nests and Eggs of Indian Birds ”? there is a record of a pair of House-Mynahs (Acridotheres tristis) which built in a hole under the edge of a roof fully exposed to the Indian hot- weather sun, with the result that both of the pair were always to be seen off the nest, the cock singing vociferously and thrashing casual Crows after the usual manner of his kind. There is a whole family of birds, allied to the Game-birds, which carry matters further, and never sit on their eggs under any circumstances, these being the Megapodes or Mound-builders, referred 156 BIRD BEHAVIOUR to above as producing young which are able to shift for themselves as soon as hatched. Owing to one of the largest of them, the Australian Brush- Turkey (Catheturus lathami), being frequently im- ported, their habits in at least one case are fairly well known, and have besides been studied in their - native haunts in the case of several other species. Generally speaking, they live in Australia and New Guinea, but one, the Maleo (Megacephalon maleo), is found in Celebes, and the birds of the typical genus Megapodius, which are more like large dull Partridges than anything else, are widely spread from the Nicobars to well out in the Pacific Islands —Ninafou andSamoa. All lay very large eggs for their size, so that here at any rate large size of egg corresponds with high development of the young when hatched, and make up their natural incubators with their powerful feet, in which the hind toe is well developed and low set, although they do not perch more than the typical Game-birds. Their claws are often very long and strong, and they present the peculiarity, only found elsewhere among birds in the Cuckoos, of having the second and third toes, z.¢. the inner and middle front ones, joined by a short web at the base, whereas this web, where it exists in other birds, is either between the outer and middle toes—third and fourth—as in the Herons, or connects all the toes, as in typical - Game-birds. I mention this point because it is commonly supposed that small points not obviously ~ connected with habits, and hence of value in classi- NATURAL INCUBATORS 157 fication, are only to be discovered in bird anatomy, whereas they occur externally also. The Mound-birds always lay several eggs, and always bury them; but their procedure in this respect varies: the Maleo simply inters them in beaches of black volcanic sand, and is supposed to deposit them in the hatching-holes at intervals of a fortnight. The Brush-Turkey hens, however, lay every two days, and the species of this family generally scratch up mounds of earth, sand, and dead vegetable matter, that of the Brush-Turkey having a circumference of three dozen yards, with a height of a little over two feet. In this species, as observed in captivity at all events, the male does all the work of preparing the mound and looking after the eggs, when laid and buried, driving the hen or hens off as soon as they have laid, and then covering them deeply or thinly as ~ occasion seems to demand. As many as twelve to fifteen eggs may be laid by one of these birds, but sometimes several pairs may share a mound, though this seems not to be the case with the typical Megapodi1, which also use more sand and less vegetable matter than the Brush-Turkey. The latter bird breeds in the preserves of the Duke of Bedford, and did so in the Zoo in a quite small enclosure during the Bartlett period, and of late years when Mr. Bertling was head-keeper. When hatched, the young scratch their way out or are dug out by the old birds; and not only are they hardy when hatched, but their development 158 BIRD BEHAVIOUR in the egg appears to be able to proceed in some cases without any extraneous heat, such as is cer- tainly generated in the Brush-Turkey’s mound by the decaying vegetable matter. More than a dozen years ago, some eggs of the Nicobar Megapode were taken from a mound in the islands and put on board the Government ship Elphinstone. Here they were allowed to lie about on deck in a bucket, and when the ship got up to the British settlement in the Andamans they were put away in a cup- board; nevertheless some chicks at all events hatched out and were reared, and I saw these at the Calcutta Zoo, where they were sent when full — grown. It would appear, however, that the tem- perature in these Megapodes’ mounds is not high, the part where the eggs are buried being if anything cool to the touch. The Mound-birds are a group with a long incu- bation-period, the Brush-Turkey, a bird of the common Fowl’s size, taking six weeks; the incuba- tion-period of birds being a group-character or. minor habit, differing in length according to the family to which the bird belongs, but, in the case of birds of the same family, being generally in proportion to the size of the species, large birds generally taking a longer time than small ones. . Thus, among our familiar tame birds, the Fowl, as most people know, takes three weeks, the Turkey © and Peacock a month; the common Duck takes a month, the large Muscovy Duck five weeks, the Goose four, the Swan six. Both the Duck and SIZE AND SITTING-TIME 159 Fowl belong to long-period families; among the short-period birds we have in domestication, the Pigeon takes seventeen and the Collared Dove fifteen days, and the Canary a fortnight, both Pigeons and Passerines having short incubation periods. Owing to this family limitation of periods, we get some very curious contrasts; such big birds as the Crowned Pigeon (Goura coronata) and the Raven only taking three weeks, while the tiny Painted Quail (Lxcalfactoria sinensis), no bigger than a Sparrow, and the Teal, not larger than a Pigeon, take as long, and the Storm-Petrel even five weeks, in spite of its small size. It will be seen that however small the bird, the reduction of its incubation-period does not keep pace with the size; nor does the increase in the case of large species. Some of the smallest Finches only sit for eleven days, and even the Humming-birds are only credited with a day less ; the longest incuba- tion period is that of the Emu, in which the devoted male sits for nine weeks, longer than the Ostrich, with its six or seven, but this bird belongs to a _ distinct family, all the clans of flightless giants being very well differentiated anatomically, and evidently representing independent degenerations from flying ancestors, though of an early type. In a few cases the smaller bird in the same family may take a longer time than a larger; thus Part- ridges and Gold Pheasants take longer to hatch than Fowl chicks. The case of the common Pheasant, 160 BIRD BEHAVIOUR which also takes longer, need not be mentioned, because the wild fowl is not so large as this bird, and curiously enough increase of size in domestica- tion, however great, does not seem to affect the incubation period to any noticeable extent. There does not seem to be any general correlation between the activity of the chick and the period of incubation ; the young of the Hemipodes or Button- Quails, birds about the size of Quails proper, hatch in only twelve days, although downy and active, while the helpless nestlings of the Budgerigar, an even smaller bird, take nearly three weeks, Parrots being a long-period group; and the nestlings of birds of prey require a long time to hatch, the largest, the Condor, even requiring six weeks. On the whole there is a tendency for water-fowl to take a longer time than land-birds, no aquatic groups having a really short period, though none take so long as some of the great runners. ‘The period of incuba- tion does not vary more than a day or two unless over a month, when the variation may be a matter. of several days, as in the case of the Swan and Ostrich. As the temperatures of different groups vary, incubation may be hastened artificially in some cases; when Mandarin Ducks were first bred at the Zoo, now nearly seventy years ago, it was noticed that those of their eggs which were put under hens hatched two days earlier than those which the Ducks themselves were allowed to sit upon. M. Rogeron, in discussing Hens as foster- TESTING THE TIME-LIMIT 161 parents for these and other fancy ducklings, con- demns some Hens as altogether too hot, so that the eggs entrusted to them come out so much too soon that the young are weakly and unsettled, and die off through sheer inability to live. __ The frequency with which eggs of birds have been placed in domestic conditions under other individuals or species has brought out conspicuously the great difference in patience in sitting birds; Hens and Turkeys will often sit out two periods if compelled or even allowed, while Pigeons refuse to incubate more than a day or two over their limit, and I do not remember any case of water- fowl exceeding their time. However, the Hooded Crow, although one would have thought this cunning bird not easily duped, will, according to Graham in his “ Birds of Iona and Mull,” sit so far over her time when her eggs have been removed, boiled, and replaced by boys, that she is easily captured through the weakness and exhaustion caused by this unnaturally protracted incubation. Evidently the Crows are not immune from the extreme mental upset which occurs during the incubation period ; poultry-keepers well know that the most effectual cure for a broody Hen is to place her in a coop with barred floor and supported on legs, for some Hens will sit almost indefinitely, not only on any object they can imagine to be an egg, but even on an empty nest. By making the bird continually perch, however, the delusion becomes impossible of maintenance, especially if II { 162 BIRD BEHAVIOUR her mind is distracted by seeing the other Fowls enjoying life outside her prison. The domestic Hen is not alone in being able to solace her mind with a substitute for an egg; Hume in his ‘ Nests and Eggs of Indian Birds” gives an amusing account of a Kite which sat upon a pill-box until rain wrecked this treasure; and a pair of Cranes nesting in captivity, but unable to produce eggs, fished up a couple of pieces of brick from the bottom of their pond and made believe they were eggs. Facts like these are of importance when we consider the ease with which birds, even of intelligent kinds, may be duped into caring for eggs of parasitic species. There is, as a matter of fact, a physical as well as mental change in a sitting bird; the abdomen becomes inflamed and bare, constituting the ‘‘ hatch- ing spot,’ and no doubt it is irritation here, not a self-sacrificing feeling, which makes Ducks pull off the down of their breasts which they then use as a nest-lining. In the hole-building species indeed this practically constitutes all the nest, but in tropical Ducks, although these often, in fact per- haps usually, breed in holes of trees, this lining is scanty, and may be wanting altogether. The commercial importance of the female Eider’s . down—the drake contributes none, apparently even in an emergency—is well known, but a physio- logical fact about this bird which is less familiar is its power of enduring a fast while sitting, at any Tate in captivity, Mr. St. Quintin, one of the few SUPPRESSION OF SCENT 163 people who have bred the species, recording that a bird of his seemed never to leave the nest during the whole time of sitting, so that chickweed growing around grew all over its back. In any case birds need little food while sitting, and their excreta are concentrated in a remarkable way; any one who keeps Fowls or Pigeons has noticed that when a sitting hen leaves the nest she voids a large mass all at once, and the scent appears herein to be concentrated, thus explaining the fact that the body-scent of a sitting game- bird, so perceptible at other times to the nose of a questing beast of prey, becomes suppressed, being as it were driven inwards. In spite of the wearisome nature of the task as it appears to us, it is evident that birds must experience great satisfaction in the action of incubation, as also in the more toilsome but seemingly more interesting process of rearing the young, since they are so irresistibly impelled to it that in many cases it is repeated several times during the year; in fact, some tame birds, such as fancy Pigeons, Canaries, and Budgerigars, would endanger their health and produce weakly offspring by continually breeding—in the case of the last even in out-door aviaries in mid-winter—if their owners did not by removing nesting facilities, or even by separating the sexes, put a stop to propaga- tion after a reasonable number of broods had been raised. Birds which have active young are less philo- ~~ 164 BIRD BEHAVIOUR progenitively inclined, the rearing of one brood satisfying as a rule both wild and domestic species of this character for the year, even the pampered park Mallard not breeding in autumn, though they pair; and among the birds which have helpless young, or at any rate young which have to be fed, the least fertile, z.e. those which lay but one egg at a time, are also the least apt to want to repeat the process. The diving rock-birds which throng our cliffs, for instance, depart to sea quite content with their single chick. Pigeons, however, are quite willing and anxious | to repeat their task of rearing twins as often as occasion allows, that is to say, as long as they can get plenty of food. I have seen Wood-Pigeons in Regent’s Park, where conditions are exceptionally favourable, pairing at Christmas in very cold weather, and in India nests of the commonest species of Turtle-Doves are to be found practically all the year round, so that these birds apparently are always ready to breed, except, no doubt, when moulting, at which time the most enthusiastic nesters have perforce to postpone operations. Ordinary passerine birds, also, frequently rear two or even more broods in a season, so that even when their sittings are individually less in number than those of birds with active chicks, their total output for the yearislarger. There are also certain individual species which have a special bent for - procreation, and will commence nesting on less provocation, if I may so express it, than any others ; -POPULAR RECORD-BREAKERS 165 such are the birds that are commended as “‘ good breeders” by aviarists, and in wild nature in this country we may notice that it is the Song-Thrush and the Robin which generally contribute the. ‘* early bird’s nest” newspaper records, leaving even such prolific birds as the Blackbird and the Sparrow far behind in the race for actual priority of com- mencement, though these may equal the output before the year is over. | Generally speaking, however, it may be said that wild birds nest only once a year, and some of the large birds of prey are said only to do so in alternate years. CHAPTER -VI Propagation (continued)—Nest-making not purely a bird-habit © —Eggs laid without nests—Types of nests—Parasitic nesting —Parasitic layers, like Cuckoos and Cow-birds—-Degrees of development of parasitic instinct. Birps are not alone in incubating their eggs any more than in laying eggs at all; for pythons among snakes incubate their eggs, coiling round them and undergoing a rise of temperature, while the Echidna of Australia, one of the only two egg-laying mammalian types—the other oviparous beast being the Duck-billed Platypus—carries her single egg in a temporarily formed pouch. ‘The two eggs of the Platypus are laid in her burrow. Neither is nest-making confined to birds, for, putting aside the extraordinary structure made by. many insects, we have nest-makers among the vertebrates in the persons of many fish— including our little stickleback—in some tropical frogs, and in numerous beasts from the gorilla to the harvest- mouse. These points are worth menticning, be- cause some naturalists theorize about birds’ nests as if nest-making were a special bird habit, whereas for all we know the particular reptile which pre- ceded the first definite bird may have been a nest- builder already. ; 166 INCUBATION WHILE STANDING 167 Be that as it may, many existing birds make nests no more elaborate than those of some reptiles ; the practice of the Mound-builders in burying their eggs is much the same as that followed by crocodiles and tortoises, and the African or common crocodile (Crocodilus niloticus) has been observed in Mada- gascar sleeping on her deposit of eggs, and is be- lieved to keep on hand to dig up the young when they hatch, and take them off. This is very like the action of the Mound-birds—and also of those fish which guard the nest, aerate the eggs, and pro- tect the young—and as the crocodiles are the nearest related of present-day reptiles to birds, as their anatomy and bird-like eggs testify, it is tempting to regard the Megapodes as the most primitive of nesters, especially considering the advanced state of their young on exclusion from the ege. If, however, a previous coat of down is shed in the shell, they are not so primitive as they look, probably, but have gone back to the simple life. In any case, there are birds which do far less in the way of nesting. The two giant Penguins, the King (Apienodytes pennant) and the Emperor (A. forstert), for instance, do not put their single egg down anywhere, but keep it pressed up against the skin of the abdomen, which bulges over it, and supported by the feet, which are kept close together, and so incubate standing. ‘The bird thus cannot walk freely, but it can shuffle about awkwardly, and thus move its egg from place to place if necessary. The habit seems reasonable enough in the Emperor, 168 BIRD BEHAVIOUR which breeds on the Antarctic ice at mid-winter, of all seasons, and so needs to protect the egg and chick from cold before everything, but in the King, which does not reach the Antarctic circle at any time, and breeds on land, the habit seems less significant. It is curious, too, that as the great danger of the infant Emperor’s life is the scrimmage for its pos- session which results when it is seen, all childless Emperors desiring to foster it, the only break in the whiteness of its down is the black skull-cap, making its little head conspicuous against the white belly of the parent, and thus proclaiming the possession of the treasure. ‘The young King is quite different, being dark brown all over, though the parents are so much alike. It is easy to see why these birds only lay a single egg, and also why this is the case with the Guillemots and Razorbill, and ~ with the White Noddies, which have the next simplest nidification, simply laying the egg on an unprepared surface and keeping constantly on it. | The nesting-places of the Auks above mentioned are high cliff-ledges, often even sloping seawards, so that the egg, in spite of its sub-conical shape, would roll off if one or other of the birds did not constantly sit on it, which they do facing the rock, no doubt so as to minimize the chance of dragging the egg off with them when leaving it. But that of the tropical White Noddies, re- nowned for their spirit-like appearance and uncanny. tameness, is not only a point of a coral reef, but PHENOMENAL FORESIGHT 169 equally or more often the branch of a tree or the broad leaf of a palm; any slight depression is chosen if possible, but often even this is dispensed with. ‘The bird covers and leaves its egg very gingerly, and is credited with such foresight as, when laying on a leaf, so to time the hatching that if the leaf withers and droops, by the time the slope has become too dangerous, the egg will have hatched. The chick has great powers of holding on, having particularly long middle claws; the hind toe is also of normal size, not rudimentary as in other Terns, and the feet are only half-webbed. As the plumage is also scanty for a water-bird, and the bird nests inland and even eats fruit, we have here perhaps a primitive Gull-type. Other birds that simply lay their eggs on the spot chosen without any nest are the Nightyars proper, though the Owlet-Nightjars lay in holes in trees, and the Frog-mouths, members of the same family as the last (Podargide) make nests, of sticks in the case of the well-known Australian More-pork (Podargus cuviert) and of a curious pad of down on a branch in the case of the Eared Frog-mouths (Batrachostomus). Simple deposition of the eggs on the ground is unusual in birds of the type to which Nightjars belong, but is not uncommon among running or swimming birds; Divers, Sand-Grouse, Bustards, and many of the Game-birds, Plovers and Terns making either no nest at all, a mere “scrape,” or a very meagre collection of bents, leaves, etc. ‘The habit 170 BIRD BEHAVIOUR varies, for in the same ternery some nests will have practically no furnishing, and others be fairly well provided. Some birds, such as the Ringed Plover when breeding inland, and the Adélie Penguin of the Antarctic (Pygoscelis adeliz) build nests of stones, which in the latter case are indeed the only available material; and the male Penguin “ proposes ”’ by offering the hen a pebble. In the case of this Penguin the nesting-site appears to belong to the hen, which arrives first and takes possession; but in some cases at all events nesting-site property is vested in the male bird, which brings his hen to his chosen haunt, or arrives there first and guards it for her, when the two have been separated on migration, as male birds generally arrive first. The next simplest plan to laying the eggs on the ground is laying them in a hole therein, or in a rock or tree, without any nest; this is a common _ practice, especially characteristic of Parrots, Owls, and some other non-passerine perching birds, such — as Toucans and Hornbills. Holes often have to be cleaned out, and so this practice passes naturally into the widely-spread custom of the bird excavating its burrow itself; in fact, the two habits are hard to separate, as often the same species will occupy a hole if it is there already, or make one for itself if such accommodation is wanting. Burrowing is found in scattered members of many groups, such as the Burrowing Owl (Speotyto cunicularia) of America, the Sand-Martin and some a 41 = = 27) = = res ~ Yy — = = oS zs 5 iu = = (59) yy — — wn om - i) i pep ty od HE Hs MQ a, 12) Z, maw a, OZ. pas sx Ff YU oO WVU — A = fq & aS E-CASQU ith the nesti hole in CONCAV hown w. SS i 1es This Asiatic spec 170 Sth et ell — . i a tr ‘PLHOAL PIO SY} JO S9forLO popLst “SIVIG If} JO OuUtOS OF oOUVI[CUMOSo1 [vloyazodns osopo v Sivoq p1Alq WweolLomMy YyIHos stiff “ISUN-ONVEL NVITIZV Ae BIRDS AS BURROWERS 171 other Swallows, the Minera (Geosttta cuntcularia), a South American passerine bird, some Penguins, and the Puffin amongst the Auks; but it is espe- ciallycharacteristic of birds which sally forth for their prey from a perch and return to it, using their feet but little, such as Kingfishers, Bee-eaters, ‘Todies, and Motmots, and of Petrels among the sea-birds. Bee-eaters are most inveterate burrowers, forming regular warrens and even sometimes burrowing into level ground as Petrels do, most. bird-burrowers generally liking a bank for their tunnels. It has been said that animals which do not get their living by burrowing do not show any special adaptation for it, and the Sand-Martin is a case in point; but the Kingfishers and other burrowing perchers, where burrowing is a family habit, are noteworthy for the union of their toes, forming a flat broad sole, which must be of some use in throw- ing out the sand. It is true, however, that Horn- bills have similar feet, although they do not burrow, but nest in holes in trees as said above; but they are near akin to the other joined-toed families. Kingfishers when starting a burrow have been seen to dart at the bank and dislodge the earth by this charge, the pair relieving each other and repeating the action until a big enough depression was made to allow them to get to work with their feet as well. Parrots with their gnawing beaks and powerful short legs are better adapted for burrowing than any other birds, and some do thus nest in banks, such as the Patagonian Conure (Cyano- 172 BIRD BEHAVIOUR lyseus patagonus), one of the few Parrots living in temperate and cold climates, as a usual thing, and the well-known Lemon-crested and Rose-breasted Cockatoos occasionally. The strangest of burrowers is, however, the remarkable pied Crab-Plover (Dromas ardeola) of the shores of Eastern seas, for one would never expect a long-legged wader like this to burrow; yet it does so, and lays at the end of its bow-shaped tunnel one large white egg, having in fact the nesting- habits of a Petrel. This bird is a primitive type, being curiously intermediate in appearance between a Plover and a Gull, with half-webbed feet provided with a well-developed hind toe, unlike the families to which it is most nearly related. As to what long-legged birds can do in the way of digging, I never realized this till I saw the cock Rhea making his ‘‘ scrape,” which he does in a crouching position, and nevertheless thus uses his powerful limbs to great effect. Among the Woodpeckers, the Ground Wood-. pecker of the Cape (Geocolaptes olivaceus) burrows in banks, but, as every naturalist knows, these birds generally cut out their nesting-holes in trees; this is all part of the day’s work for the Woodpecker, which is a carpenter by trade, but the Barbets do it too, although not pecking wood otherwise, and curiously enough have a fancy for beginning the hole - _ from the underside of the bough, so that they have to commence operations upside down. Where burrowing or tree-hole-cutting is a family AN ABNORMAL KINGFISHER _ 173 habit, no nest is made by the bird, the eggs being laid on the floor of the hole; in fact, such birds throw out all they find inside a hole, and the Starling greatly annoys and even dispossesses the much larger and more powerful Green Woodpecker by carrying nesting-stuff into his borings. When, however, the hole-builder, burrower or merely appropriator, is a member of a family whose general custom is to nest outside, something like the normal nest of the family, though often a very slovenly one, is made, as by the Sand-Martin, Jackdaw, Stock-Dove, and Sheldrake, and the many kinds of Tits. This points to the hole-building in these cases being a recent habit, but some members of genuine troglodyte families may as an abnormality build a nest; Mr. E. C. Stuart Baker has found the Indian White-breasted Kingfisher (Halcyon smyr- nensis) doing so, the structure being a domed one of moss. ‘There issome connection between making a domed nest and breeding in holes, for, as every one knows, the House-Sparrow, whose nest is naturally a domed one in a tree, readily takes to nesting in holes, and so do many of the small foreign Finches commonly imported. In the case of the Tree-Sparrow, the hole-building habit has apparently nearly superseded the tree- nesting one, a nest of this species anywhere but in a hole—of a tree in most places in Europe, or of a building in the Himalayas, Japan, and a few other places—being cited as a notable exception. ‘This is 174 BIRD BEHAVIOUR of interest, because the Tree-Sparrow is in some respects the most advanced species of the true Sparrows, having in both sexes a coloration which is masculine only in its nearest allies, and the widest distribution, for the House-Sparrow, though actually found in more countries, has in many cases been transported deliberately by man, whereas its rival colonizes on its own account. Nesting with a covering of some sort, found existing or constructed, overhead, is a habit of which birds which possess it are very tenacious, and however intelligent they may be in other ways, such birds seldom venture to nest in the open; of this the Sparrow, Starling, and Sheldrake are conspicuous examples. Nevertheless among birds which make nests as opposed to burrowers, dome- builders are the exception, most constructed nests being open, either mere platforms or piles, such as those of the Woodpigeon and the Moorhen, or advancing to the state of a more or less deep CAP such as is built by most passerine birds. Such nests with elevated sides or domed roofs may be built by a process of felting, as when made with moss and similar substances, or actually woven with a skill which is at times most admirable. Unfortunately we are not well off in the north for very skilful nest-builders, and the only woven nest of a British-breeding bird is that of the Golden Oriole, a species unfortunately too much persecuted to have other than the rarest chances of exhibiting its skill; the nest is a woven hammock, suspended TROUPIALS AND ORIOLES 175 in the fork of a bough, and this is the type of nest built by the true Orioles generally. The Troupials, wrongly called Orioles in America, from their frequently similar yellow-and-black coloration and general habits, build, however, far more wonderful nests, though curiously enough these are woven also; their constructions are long bags like the old-fashioned netted purses, with the entrance hole at the top near the point of suspension to the bough. Woven pendent nests, but with the entrance at the opposite end, are also made by the Weaver-birds, whose stronghold is in Africa, though the Baya (Ploceus baya), one of the best - builders, inhabits South-west Asia. The males in these birds also are commonly yellow and black, forming a curious but possibly significant correlation of a type of colouring elsewhere very unusual in birds with the supremest of skill in nest-building. In the nest of the Bayas proper (Ploceus baya and P. atrigula), which are about as perfect as any of these Weavers in building ability, we get first a suspension cord attached to the end of the thin bough or section of a palm-frond which bears the nest; then the bulb of the nest itself, which at one side passes downwards into the long entrance-spout. A section of the interior would show that the nest- cup is divided from the entrance-spout by a firmly bound partition, which prevents the young falling out, and is also used by them as a perch when older. When the nest is about half-finished—i.e. all but the cup and spout, the top half being done— 176 BIRD BEHAVIOUR this partition, then a mere bar dividing two holes, like the handle of an inverted basket, forms a useful perch for the bird working inside, a position which is taken up by the hen, which passes out the ends of the material as they are thrust in to her by the cock. It is probably owing to the want of this feminine assistance that the nest is so often left unfinished in captivity, and that so many half-built nests are found in the wild colonies, the building of these being the amusement of the males when unoccupied. Many of these will also go on lengthening the tubular entrance after the sitting has begun; it will be noticed that this is always left loose and unbound at the end, such apparent negligence being an additional safeguard against attacks by snakes and other enemies. Another safeguarding instinct noticeable in these birds is that of hanging the nest whenever possible over water; it has been found that even the water in the bathing-pan in an aviary incites some Weavers at all events to nest directly over this. The Baya itself is not commonly imported com- pared with some of the African Weavers, far the commonest bird of the kind in the trade being the small Red-billed Weaver of Africa (Quelea quelea), which anybody can buy cheaply and watch in any bird-room or back-garden aviary. Its nest, however, like that of many other Weavers, cannot be compared with that of the Baya, as it lacks both the suspension rope, being merely woven in amongst RESOURCEFUL CRAFTSMEN _— 177 twigs, and the downwardly elongated entrance- spout, being simply a round nest with an entrance- hole below. It is, however, the skill in working the material that is the great attraction in Weavers’ nests, not the exact form assumed, which is not more wonderful than that of many other nests. The Baya may at times exhibit what looks more like reason than instinct in getting its material ; cocoanut fibre or ordinary grass will do, but it has been found building with grass which was far too broad; and in this case the bird alighted on the great blades, bit down to a sufficiently practical breadth, then went further down the blade till it had the right length, bit into the blade again, and then flew off, tearing away the strip as it went. As this grass also had a serrated edge, so that it could only be passed through one way, it is difficult to refuse reasoning powers to this particular colony of Weavers at all events. In the Weaver the constructive instinct is very much stronger in the male than in the female, but, though many birds share the labour of nest-building with their mates, the constructive instinct is com- monly more feminine than masculine, and some birds leave the construction entirely to the hen. The male, however, often supplies material, as generally with Sparrows and Pigeons, or he may accompany the female to and fro in her trips to get it, no doubt to keep watch over her safety while thus pre-occupied. He always takes some interest if he cares about the nest at all, which ie 178 BIRD BEHAVIOUR many males, especially among the Game-birds, do not. The male Globose Curassow (Crax globicera), however, seems to be the chief constructor himself. Nests of the felted type, well exemplified by that of our Chaffinch in a cup form, are often built in a pensile and domed pattern as well as woven ones, especially in the tropics, where the abundance and variety of enemies render necessary in the case of all defenceless species either inaccessibility of the nest or its very perfect concealment. In India, for instance, nearly the only nests one ever ordinarily sees besides those of Crows, Kites, and other strong birds are the pensile ones of the Bayas. Now and then one may find the pensile felted nest of a Sun-bird, but this is often well concealed by looking like a bunch of rubbish ; indeed, it is made of all sorts of odds and ends— bits of dry leaf, masses of caterpillar “‘ frass,” aa so forth, matted together with spiders’ webs, great stand-by for birds which build these pensile felted nests. I have even seen a pair of the Amethyst-rumped Sun-bird (Cinnyris zeylonica), the commonest kind in Calcutta, come into my verandah to carry off scraps of the grey fluff which is swept out of rooms, for use as nesting material. Extremely beautiful felted nests are built on the pensile principle by the tiny Flower-peckers (Diceidz) of the Eastern Tropics, minute birds haunting tree-tops. These nests are matted together with cobweb, and are so well made that FELTING AND TAILORING 179 they can be folded up without injury ; the entrance is near the top, and they look more like little wash- leather purses than anything one could imagine a bird could make—in fact, with the exception of some mud-nests presently to be described, they are the most artificial-looking products of any form of bird industry. The felted erect oval nest of our Long-tailed Tit has been long and deservedly admired, but that of the Cape Tit (4 githalus capensis) is even more remarkable, composed as it is completely of plant- down, so closely felted that it is like cloth, and provided with a tubular entrance, not at the bottom, as in Weavers’ nests, but near the top. Stark observed the hen closed this by pinching its edges together when she left the nest, either to keep the latter warm or to keep foes out, which no doubt it would do, for at any rate he once saw the mistress of the little house herself fail to get in again easily. Under this vestibule is a little pocket, in which the cock is supposed to sleep, and very likely does, Tits generally sleeping in some hole, or at any rate not on a perch in the usual way. Besides weaving and the simpler process of felting, birds occasionally practise sewing, though this form of industry is rare. The best-known sewn nest is that of the little olive-green Wren-like Warbler called from this habit the Tailor-bird, and one of the most common—and noisiest—inhabitants of Indian gardens. The nest itself is simply the 180 BIRD BEHAVIOUR lining of a cup made by sewing two or more leaves together, or the edges of one large one, and is very. hard to find. The bill is of course the needle, and the thread is the raw silk of caterpillar-cocoons, which holds by reason of the resistance of this stuff to the edges of the pierced leaf, for the story that the bird makes a knot is a slight exaggeration, just like the tale of its picking up a dead leaf and sewing it to a live one. Such leaves may be found sewn together, but this is when one leaf has withered after being sewn. Several other small Warblers make sewn nests in India, and so do some of the large dull-coloured Sunbirds of the genus Arachnothera, known as Spider-hunters ; in this case the nest is secured to a broad leaf by having part of the material pushed through holes bored in this, but the structure is not nearly so perfect as the little Tailor’s. So many birds mix the basket-work of their nest with mud—even the Baya putting in a few patches —that complete nests of primitive earthenware are not surprising, though some fibre is generally, if not always, used. Such nests are familiar to us in the case of the House-Martin and Swallow, the former being far the more perfect type. For these the birds simply take up the mud in mouthfuls, and judiciously build little at a time, lest they should overweight the foundations, as White long ago ~ observed in his admirable chapters on these birds. Some Indian and Australian Swallows, such as the Striated Swallow (Hirundo striolata) in the TYPES OF PENSILE NESTS, I. Philippine Red Sunbird ; 2. Cape Penduline Tit or “‘ Kapok-vogel”’ ; 3. Indian ‘Tailor- : bird; 4. Blood-breasted Flower-pecker. (Copyright, Hutchinson & Co. 180 NEST OF CENTRAL-AMERICAN SWIFT. This species (Panyptila sancti-hieronymi) builds a nest not unlike that of a Weaver-bird in shape. THE BIRDS AS POTTERS 181 former country, and Fairy Martin (Lagenoplastes ariel) in the latter, make even better nests than the House-Martin, resembling mud jars attached by the base to their support, which is commonly a wall, these Swallows, like most of their group, readily availing themselves of man-made facilities. Three Australian birds, not apparently very nearly related and not at all like Swallows, the Grey Struthidea (Struthidea cinerea), White-winged Chough (Corcorax melanorhamphus), and Magpie- Lark or Pied Grallina (Grallina picata) distinguish themselves by making nests in the form of mud bowls, so extraordinarily true that if they were not attached to a support they could not be dis- tinguished from crude human-made pottery. Another wonderful mud-worker is the South - American Oven-bird, whose domed nest, seated on a bough or post, has a side porch which renders invasion of the nesting chamber almost impossible. ‘This is a very heavy nest, takes months to make, and lasts for years. ‘The bird is a homely one, and a popular favourite, being called, like our Redbreast, by a Christian name, in this case ‘** Alonzo Garcia” -or “ Alonzito,” and credited with not working on Sundays, no doubt because it takes a spell off now and then. A close ally of this bird, curiously enough, is the burrowing “ Minera,” which reminds one of the great difference of the nesting-habits of the House- and Sand-Martins. A combination of hole-building and mud-masonry is found in the nest of the Nuthatch, which has the 182 BIRD BEHAVIOUR entrance walled up till only sufficiently large to let the owner in; and just as the Martin’s nest is exaggerated into a bottle by some foreign Swallows, so the Syrian Rock-Nuthatch carries out the entrance-plaster into a regular cone, using resin as well as mud in the construction. Generally speaking only passerine birds are skilful nest-builders, nest-building, even more than song, being the “‘ strong suit’ of this great group; but among some non-Passerines we find fairly remark- able nests, especially the strange secreted nests of the edible-nest Swiftlets (Collocalia). ‘The isinglass- like secretion of which the species whose nests are used in commerce is made (Collocalia francica) is simply the solidified saliva ; the flow of this secretion is very copious in nesting Swifts, and many gum their nests together with it, but even the other Collocalias use extraneous materials, and so render the nest commercially useless. At the time of writing, the edible nests could even be bought in London. : The handsome Eastern Crested Swifts (Dendro- chelidon), which differ from other Swifts in perching on boughs like Swallows instead of clinging to vertical surfaces, build a very curious little saliva- nest at the side of a bough, just large enough to hold their single egg, on which they do not actually sit in the nest, but perch on the bough and cover their treasure with the breast. Such a nest is naturally exceedingly hard to find. Another Swift, from Central America this time SWIFTS AND HUMMING-BIRDS 183 (Panyptila sancti-hieronymt), builds a nest out of downy plant-seeds matted together with saliva, a sort of gum-felt fabric, in fact; but the curious thing about it is not this method of building, which, as will have been gathered, is normal for a Swift, but the shape, which is quite unlike a cup, but resembles a Weaver’s nest, being a bulb with a long downwardly directed entrance-spout. ‘There is, however, no suspension rope, the upper part being glued against the underside of a rock. Those fairy-like allies of the Swifts, the Humming- birds, are skilful nest-builders in their way, making felted cups of plant-down on branches or even large leaves ; their nests are very small even for the size of the birds, and seem to be much alike in type throughout the family. It will be noticed that the Crested Swifts, which are much more brightly coloured than other Swifts and even show orna- mental plumes, and also perch like Humming- birds, show some slight approach to this style of nesting, though with the nest even more reduced and composed of salivary material. Apart from Passerines, Swifts, and Humming- birds, there are few skilful nest-builders, the nests of almost all other birds being of a very ordinary character, generally mere platforms. The Ham- merkop or Tufted Umbre of Africa (Scopus umbretta), however, a queer primitive outlier of the Stork and’ Heron group, with the size and plumage of a Buzzard and a slight hook to the beak, builds a domed nest like an exaggerated Wren’s nest, the lt, SS TD Sy, Regen, I a at en ee, ir call I a Ne ve ee 184 BIRD BEHAVIOUR last sort of nest one would expect such a bird to make; and among the Parrots, which have been accused of being too clumsy to build nests at all, the Quaker Parrakeet (WMyopsitiacus monachus) of South America not only builds a stick nest with roof and porch, but goes in for tenement nesting, several birds building in one clump, though the actual rooms are separate. A few non-Passerines build mud nests, such as that extraordinary fruit-eating ally of the Nightjars, the South American Guacharo (Steatormis cari- pensis), no doubt a primitive form, as its beak is less specialized or degenerate than a Nightjar’s, and not so abnormally enlarged as a Frog-mouth’s. Among the waders, Flamingoes and the Sun- Bittern also build mud nests, but in all these cases the nest is a mere cheese-shaped hassock, as it were, displaying no special merit in architecture. It is interesting, however, .to ‘find that other birds than Passerines have so much constructive ability, clumsy or not; and in this connection it . should be noted that the Broadbills, Passerines of a very primitive and clumsy type, build pendent nests nearly as good as those of Weavers. Nor can we say that birds of special intelligence will neces- sarily build an elaborate nest, for the clever Crow tribe, with the exception of the common Magpie - with its domed nest of thorny branches, build nests of the most ordinary type for passerine birds. Parasitic nesting is extremely common among birds, especially among hole-building species which bor *S MOoTe,T & OAT] AIDA [[Iq p9y}00} ‘poyxooy e sey ‘19}ed-jMIF we YSnoY Ve ‘oreyorNy sy TL “LSHN GNV SOUVHOVND FLAMINGO ON ITS NEST. Showing the sitting position, which is rarely assumed by the Flamingo except when incubating. SWIFTLETS AND THEIR NESTS. These Swiftlets are the smallest of the family, not being so large as the Sand-martin among the Swallows. IN SEARCH OF LODGINGS 185 do not bore for themselves or are anxious to avoid the trouble; thus many birds avail themselves gladly of the nest-borings of Woodpeckers, from Tits to tree-breeding Ducks such as the Golden- eye and Carolina. Such Ducks, with Owls and Kestrels, are among the most inveterate of nesting parasites, few of these birds having much notion of making a nest for itself. “They are often not particular about a hole, but will adopt an open nest; thus, the Long-eared Owl gladly utilizes the shallow nest of a Wood-Pigeon. The hole-builders indeed often act on the prin- ciple of “ any port ina storm”; they will parasitize mammals as well as other birds, since the Stock- Dove, Tawny Owl, Sheldrake, and Puffin all utilize rabbit-holes in this country, and in America the Burrowing-Owl inhabits those of the prairie- marmot—the so-called prairie-dog (Cynomys Iu- dovicianus)—in the northern part of the western continent, and of a much bigger rodent, the vizcacha (Lagostomus trichodactylus) in the southern hemi- sphere. In England the Sparrow-Hawk, generally, unlike the Kestrel, an independent nest-builder, has been found nesting on top of the drey of a Squirrel which was occupied at the time by the little rodent, which reminds one of a converse case recorded in Argentina, when an opossum, a great foe of birds, had established itself in one of the rooms of a com- posite nest of the Quaker Parrakeet above alluded to, the stout walls and overhanging eaves preventing 186 BIRD BEHAVIOUR him from clearing the colony, which included besides the rightful owners a tree-building Teal (of some species) as an additional but harmless parasite. The Sparrow, as we all know, too ee evicts the House-Martin and takes possession, but it is not so familiar a fact that the Swift does the same thing by him ; this seems not to have been recorded since the days of Gilbert White, but it used to happen regularly under the eaves of Mr. B. Clarke’s photographic studio at Maidstone when I was a boy at school there with his sons. In Argentina the Oven-bird’s cosy nest is coveted by a Saffron-Finch (Sycalis pelzelni) and a Tree- Martin (Progne tapera), this powerful Swallow even fighting the owners for its possession, and sometimes successfully ; and, strangest of all, the Wood- Sandpiper (Totanus glareola) and some allied species of Sandpipers breed in old nests of other birds and of squirrels. | The remarkable phenomenon of parasitism in the young of birds has been known in the case of the common European Cuckoo from classical times, and is quite proverbial, though even in the habits and procedure of this well-known bird there are many points yet to be made out; but it occurs not only in many other Cuckoos—though only in those of - the Old World, and not universally there—but has originated independently in the Cow-birds, Pas- serines belonging to the family of Troupials (Icte- rid@), which is intermediate between the Finches PARASITIC FAMILIES 187 and the Starlings in form and habits, and in the curious little birds known as Honey-guides (Ind1- catorid@), closely allied in their anatomy to the Barbets, and best known from Africa, though a few occur in South-east Asia and its islands. Among the Cuckoos, only those are parasitic which are essentially perchers, having short legs and powerful wings, and seldom coming to the ground; among these the habit seems to be uni- versal in the Old World, from the tiny and beautiful Violet Cuckoo (Chrysococeyx amethystinus) of Malay- sia, to the huge Toucan-like Channel-bill (Scythrops nove-hollandie) of Australasia, though the American Cuckoos of this type do not display it. The short- winged, strong-legged, Magpie-like Bush-Cuckoos, such as the ‘“‘ Crow-Pheasant”’ of India and the Guira of South America, are never parasitic, though the latter and its black allies the ‘Tick-birds (Croto- phaga) indulge in the custom of communal building and nestling-rearing. The general habits of the European Cuckoo are well known; the egg, which is very small for the size of the bird, is usually laid on the ground and then taken in the bird’s bill and placed in the foster-nest, though when this is conveniently situated, the Cuckoo may sit on it to lay her egg. The male may accompany the female to guard her or distract the hostility of the owners, but this is apparently exceptional, the general impression among naturalists being that Cuckoos live in a state of promiscuity and do not regard conjugal 188 BIRD BEHAVIOUR ties. T’he natives of Yarkand go further, and say there are no male Cuckoos at all, the hens being the paramours of a Shrike (Lantus isabellinus), the Barred Warbler (Sylvia misoria), or even of frogs! a belief which at any rate argues that two Cuckoos are not often seen together. — The egg, when incubated by the fosterer, develops after a proportionately short incubation period into a blind naked young bird which has a hollow in the back, facilitating the work in which it almost immediately engages of turning eggs or its foster- nest-mates out of the nest by getting under them ~ and backing upwards to the edge of the nest till they are rolled out. When, as rarely happens, two Cuckoos’ eggs have been deposited in the same nest, the ‘‘ survival of the fittest” is naturally not determined till after a severe contest. But this fury for eviction only lasts about a week, after which time the young Cuckoo will tolerate a bed- fellow. 7 The foster-parents do not concern themselves about this fratricidal behaviour in their nursery, but assiduously feed their changeling and leave the rightful heirs to die; nor is there anything wonder- ful in this behaviour, as it is the common custom of birds to neglect a fallen nestling and to give most food to that which is most strongand ravenous. © I once had an opportunity of watching a nestful of Starlings which were being reared on a roof just under my window at Oxford; and as far as [ could see there was not the least attempt at fair AN IRRESISTIBLE BEGGAR 189 feeding on the part of the parents. A very ravenous young bird appeared always to be on top of the rest, and to get nearly all contributions till he subsided and another got the opportunity of taking his place. The Calcutta pair of Dabchicks, how- ever, fed their young fairly, and I have seen a young bird pecked instead of fed when it clamoured too soon for a second helping. The fact that the young Cuckoo is assiduously fed long after it can fly is probably due to the insistent quality of its appeal; birds which have not reared one will feed it, and on one occasion when a young Cuckoo was confined in a Parrot- cage in the inside compartment of the Western Aviary at the Zoo, a Black Tanager (Lachyphonus melanoleucus), a South American species which could have had no knowledge of such a bird, never- theless squeezed through the bars to feed it. The range of foster-parents in the case of the common Cuckoo is wider than in any other, and may partly account for the wide range of the species itself, Cuckoos generally being quite as tropical as Parrots or Humming-birds, though in view of the extension into North America of the non-parasitic Cuckoos, this is evidently not the only explanation. The favourite fosterer is the Titlark or Meadow- Pipit, and presumably it is due to its dependence on this bird that the Cuckoo ranges out on to the moorlands, a habitat for which it, like most of the family, is utterly unsuited, being an awkward mover on the ground, though on trees it hops more actively 190 BIRD BEHAVIOUR than its short legs would lead one to expect. The Hedge-Sparrow is, however, a well-known victim of the Cuckoo, and is the most often spoken of, since as it is such a familiar bird itself, the alien nestling is most often seen in its easily-found nest in most places. Other well-known Cuckoo-rearers are the Robin, Pied Wagtail, and Reed-Warbler, and many other small birds are patronized, but chiefly the insec- tivorous kinds, though now and then a Finch’s nest may be selected. Larger birds are very seldom Cuckoo-fosterers, probably because they can drive off the intruder—otherwise we should expect to find the Blackbird, ‘Thrush, and Starling the commonest fosterers, their nests being easy to find and their habits in every way suitable. The Red-backed Shrike, however, in spite of its ferocity, is a not uncommon foster-parent on the Continent, though rarely so in this country. In this case, the egg’ of the Cuckoo seems gener- ally to bear a close resemblance to that or gue Shrike, but such resemblance to the egg of the fosterer is not by any means universal. ‘The Cuckoo’s egg is indeed very variable, though not nearly so much so as that of the Guillemot ; and its small size relatively to that of its producer is paralleled by the similar smallness of the egg of © the Raven above alluded to. The mottled-drab coloration which is the most usual is certainly not very unlike that of Wagtails’ and Pipits’ eggs, though the resemblance is far closer to that of the MIMICRY IN EGG-COLOUR IQI Skylark than to any other bird’s, but no Robin or Hedge-Sparrow, even if colour-blind, could fail to notice the difference of the alien egg. It is said that eggs resembling those of the foster- parents, such as the blue form found in the Red- start’s nest, tend to be confined to fosterers which are rarely patronized, leading to the inference that such are not easily duped, so that a perfect imitation has been evolved ; but such an explanation involves the assumptions that certain strains of Cuckoos always lay in particular birds’ nests, and always produce eggs of the same colour, of which there is no evidence at present. Certainly, as in the case of Tree-Sparrows and Eagles, the same individual birds do not always lay similar eggs; a very remarkable instance of this has occurred in the case of the Nightingale, in whose nest have been found an egg of the normal olive-brown, a blue one, and two of intermediate shades. In some Oriental Cuckoos there is a very perfect assimilation between the egg of the parasite and the fosterer; the “‘ Brain-fever-bird” (Hierococcyx varius) and the Pied Crested Cuckoo (Coccystes jacobinus) lay in the nests of Babbling-Thrushes (Crateropus and Argya) and their eggs are plain blue like those of the Babblers; and the Koel (Eudynamis honorata), the commonest and best- known Cuckoo in India, is parasitic on House and Jungle Crows (Corvus splendens and C. culminatus), and lays an egg very like a small Crow’s egg. It is doubtful, however, whether the imitation is here 192 BIRD BEHAVIOUR of any service, for just as Graham records in the ‘** Birds of Iona and Mull” that he got Hooded Crows to hatch Bantam eggs smeared with indigo, so Mr. D. Dewar has got the House-Crow to hatch an ordinary Hen’s egg. _ In the Koel, by the way, the parasitism is not so perfect as in the common Cuckoo; the young bird does not always eject the young Crows, and the old birds feed it after it has been reared in the Crows’ nest. I have myself, however, seen the Crows feeding a young Koel, which is curious, as they hate and persecute the old bird. The Koel avails itself of this to get its egg deposited, the male bird drawing off the Crows in pursuit of him, while the female deposits her egg, presumably laying it in the nest, this being convenient, while the bird, like so many tropical fruit-eaters, seems never to come to the ground, and so is not likely to descend in order to lay there. Another case of incomplete parasitism among Cuckoos is recorded of an African species, the splendidly glittering little Emerald Cuckoo (Chryso- coccyx smaragdineus), which Keulemans, the late well-known bird artist, told Buller, as related by the latter in his ‘‘ Birds of New Zealand,” is in the habit of hatching its solitary egg, and then leaving the young bird to the mercy of the bird - public; passing birds, he said, attracted by the cry of the Cuckoo nestling, dropped contributions into its mouth, an episode he had himself often witnessed on Prince’s Island. TOLERATION IN A CUCKOO _ $193 An allied but less brilliant species, one of the Bronze Cuckoos (C’.. cupreus), also African, 1s parasitic on such different small birds as Sun-birds and Finches; a similar species, the Shining Cuckoo (C. lucidus) of New Zealand, generally lays its egg in the nest of the small Grey Warbler (Gerygone flaviventris), which makes a pensile nest with side entrance. This same little bird is parasitized by the other New Zealand Cuckoo (Urodynamis taitensis), which is larger than our Cuckoo, while the Shining Cuckoo is much smaller. This large New Zealand Cuckoo, however, has also been found in the nest of the Wood-Robin . (Miro albifrons), and it was particularly noted that although it throve well, and ultimately sat on top of the young Robins, these also lived, and when the young Cuckoo and a young Robin were removed and caged, the old Robins fed both of them. When a nest of the Grey Warbler containing a young Shining Cuckoo was watched in the same country, however, it was noticed that the young Warblers, although not immediately at all events ejected by their bedfellow, nevertheless died off one by one, . and some were found outside. The large New Zealand Cuckoo is extending its parasitism to the introduced British birds, and also preys on their young, as it did on those of the native birds, and their eggs, when first studied ; these predatory habits make it less surprising that our Cuckoo should be credited with eating some of the eggs of the foster-parents in whose nests 13 194 BIRD BEHAVIOUR it deposits its own. Many must be familiar with the old rhyme about the Cuckoo, about which it is said that She sucks little birds’ eggs To make her voice clear. A taste for the eggs of other birds is not at all uncommon among the insectivorous species—at any rate it frequently develops in captivity, and as to the antiquity of the tradition, it must be remembered that formerly Cuckoos were evidently far more familiar to the British public than they are now, judging by the allusions to them in our literature. Shakespeare in the ‘ Midsummer Night’s Dream”? makes Bully Bottom the Weaver allude to the “ plain-song Cuckoo grey.” I fancy most people nowadays, whether weavers or writers, would not be able to say off-hand of what colour a Cuckoo is. The colour of the young Cuckoo, however, with its black barring on a ground of brown above and whitish below, is evidently pretty familiar, this changeling being so often found in the nest of its fosterer, and exposing itself when fledged quite freely until it leaves us in the autumn, in a manner very unlike the stealthy habits of its parents in the spring; so that it is not astonishing that “‘ Cuckoo” is the poultry- fancier’s term for a barred grey fowl such as the Plymouth-rock, though any brown shade in as breed would now be a disqualification. It may be mentioned that there are wild birds v6r PIAS UTBIA ,, PIOM 9} JO UOT Aad a1 & PIM dsaz $d}OU s}r asnevoaq Ooy ND STY} 0} WATS sr ., PIIG-19Adg-ure1q « GUA YAATI-NIVAA,, YO OOMDND-“MVH ,, 9UIU JT, ‘Ajrurey dy} [{e JO Popriqttistp Apopram Jsottt oy} otv od A} sry} Jo symey {3Mvy-Mortedg imo soyqutasar Ajosojs sopdods uvrpUT SIt{y, "MMVH VUMIHS CUCKOOS AND THEIR MODELS 1095 coloured just like a barred grey fowl of ordinary type and not of very high standard of marking, and that these are the grey species of the flightless Kiwis or Apteryxes. The coincidence of such a peculiar marking occurring in two such very different birds as the flightless nocturnal New Zealand Kiwi and varieties of our domestic fowls, should prepare us for coincidences in coloration, and help to make us sceptical about the survival value of the curious resemblances to Hawks seen in many of the Cuckoos. Some of these are cer- tainly most extraordinary; the Brain-fever-bird or Hawk-Cuckoo of India above mentioned is extra- ordinarily like the common Hawk of the Indian plains known as the Shikra (Astur badius) and the resemblance is not confined to the adult birds, but extends to the young in first plumage, which are differently clad from them in both mimic and model. Another member of the genus Hiero- coccyx to which this bird belongs, H. sparverioides, resembles another Sparrow-Hawk, the Besra (Acci- piter virgatus). The Hawk-like appearance of our own Cuckoo has often been commented on, but it is very sketchy compared with that of the above species, and the young and adult stages do not resemble the same kinds of Hawks, and the shape is less Sparrow-Hawk- like. Moreover, the young of the non-parasitic Crow-Pheasant is just as much like a Hawk, when of the barred type (some resemble the black, chestnut- winged adult, but are usually duller), as our young 196 BIRD BEHAVIOUR Cuckoo, and I have in Calcutta seen tame Guinea- Fowls and wild Crows distinctly impressed and apparently alarmed by one of these young birds which came into my possession, just as in the Zoo the keepers find that their small birds from many countries kept in the West Aviary are frightened if a common Cuckoo is introduced to them. A fairly good general resemblance is therefore sufficient to impress birds, but the point of it seems to be wanting. If the Hawk-like appear- ance of certain Cuckoos scares the fated fosterers from their nest, what end is served by the Hawk- like appearance of the fostered young? Besides, many parasitic Cuckoos are not like Hawks, or resemble Hawks found in a different country. Thus, the large New Zealand Cuckoo, as noted by Buller, is extremely like an American Hawk (4cc1- piter coopert), but does not so closely resemble any native Hawk; and the same Babblers which foster the Brain-fever-bird also rear, as has been said, the pied Crested Cuckoo which, with its crested head and plumage black above and white below, is like no Indian Hawk. Neither is any Hawk anywhere like the splendid Emerald, Bronze, and Violet Cuckoos, for adult Hawks and other birds of prey, like the downy young birds we have been considering, follow mammalian rules of colour, and. eschew brilliant tints except on bare parts. Some even of the non-parasitic Cuckoos may have a rather Hawk-like coloration, like the large fruit-eating Cuckoo, Carpococcyx radiatus, of the WIDE-SPREAD CUCKOO-PATTERN 1097 Malayan islands, which is indeed rather Pheasant- like in shape, but. Hawk-like in pattern. The curious resemblance between most parasitic Cuckoos and the Hawks in having long thigh-plumes must be pure coincidence, as the short legs of the Cuckoos are not suited for exhibiting this point, and besides, the’ Hawks they most resemble are long on the lee; Hawks also sit erect, not horizontally like Cuckoos. It must not be forgotten that the Sparrow-Hawk pattern, or Cuckoo pattern, whichever one chooses to call it, of a plain or nearly plain upper surface and a barred lower side, is one of the most strikingly recurrent patterns in the bird class, like the Magpie pattern to which Mr. D. Dewar ae myself have drawn attention in ourcritical work on “The Making of Species.”” It is found, for instance, among the Passerines, in many of the thence-named Cuckoo- Shrikes (Campephaga) ; in the male Barred Warbler of Europe (Sylvia nisoria); in both sexes of a little Australian Finch, the Cherry-crowned (Aidemosyne modesta); in an Australian Duck, the Pink-eyed (Malacorhynchus membranaceus); in the female of the well-known Upland Goose (Chloephaga magellanica)—which also happens to have the gamboge-yellow feet so common in birds of prey, and so rare elsewhere, instead of the orange not uncommon in waterfowl—and in both sexes of an allied compatriot, the Ruddy-headed Goose (C. rubi- diceps) ; in an Indian Owl (Glaucidium cuculotides), and in some little Doves of the genus Geopelia. 198 BIRD BEHAVIOUR The most fervent advocate of mimicry will hardly maintain that small Doves and Passerines and big waterfowl mimic Hawks; so why not put the whole thing down to coincidence? The resem- blance of our Cuckoo to a Hawk does not save it from the real bird, for Mr. J. H. Owen in “ British Birds ”’ for 1914 expressly mentions Cuckoos among the victims of the Sparrow-Hawk. The Honey-guides, which are a family of very few species, appear to be all parasitic, but practically nothing is known about the ways of the Asiatic species, not even the extraordinary and well-known instinct of guiding men and the Ratel or Honey- badger (Mellivora) to bee-nests being recorded of them. The egg of the African Honey-guides, which is white, has been found in the nest of the White-throated Swallow (Hirundo albigularis) by Mr. Ivy in the case of Sparrmann’s Honey-guide (Indicator sparrmanni) as recorded in Stark and Sclater’s ‘“‘ Birds of South Africa”; the same. gentleman recorded the egg of the Yellow-throated species (J. major) in the nest of a Drongo-shrike; while Mrs. Barber found the same species parasitizing — the Black-collared Barbet (Lybius torquatus). She also found the Lesser Honey-guide (J. minor) parasitizing the Tinker, another Barbet of very small size (Barbatula pusilla). Mr. Ivy found a pair of the above-mentioned Black-collared Barbet actually trying to fight off this Honey-guide from their nesting-hole, the intruder persistently returning ; evidently her case NESTLING HONEY-GUIDES 199 was a desperate one, for when she was shot the egg was found to be actually half-laid. No doubt it is an emergency like this in the case of the common Cuckoo which accounts for the egg being found in such unlikely and unsuitable nests as those of the Wood-Pigeon and, of all others, the Dabchick ! The strong tendency of the Honey-guides to sponge on their own relatives, the Barbets, 1is noticeable; the present species has been said to lay in the nests not only of those mentioned, but also in those of the Pied Barbet (Tricholema leuco- melan) and of a Woodpecker (Mesopicus griseo- cephalus). It is of interest here to note that the plumage of the Honey-guides is plain and ordinary in character in all the species, resembling that of the less con- spicuous Finches, and not in the least like the striking and often variegated tints of the fosterers they select. ‘They appear, however, always to use the nests of birds which lay white eggs, though their own are distinguishable from these readily enough. The young Honey-guide has the ends of both jaws sharply hooked, which is not the case with the adult; it is supposed that this structure is comparable to the hollowed back of the young Cuckoo, an adaptation to facilitate the ejection of the foster-fellow-nestlings, in this case to ensure a strong grip with the beak. ‘The young Honey- guide certainly seems when found to have the nest to itself, like some young Cuckoos and Cow-birds, but it must be remembered with regard to the 200 BIRD BEHAVIOUR structure of the beak that this is in other cases sometimes more hooked in the young than in the adult, as in young Gannets and Herons; and incidentally it would be well to examine all young Cuckoos available, to see if the non-parasitic species were hollow-backed at first as well as the others. The old Honey-guides appear to associate with the young when reared, and perhaps instruct them unconsciously or otherwise; Mr. Ivy found two old and three young birds of the Scaly-throated species (I. variegatus) together, of which only one old bird would guide him. The parasitism of the Cow-birds is in a way more instructive than that of the Cuckoos and Honey-guides, because here the gradations of the instinct can be very plainly traced. ‘These birds, which are among the most Finch-like of the Trou- pials, having short thick bills, and being able to live on dry seed which they crack in typical Finch fashion, are all closely related and easily recognizable. | One of them, the original Cow-bird (Molobrus pecoris) of North America, is as truly and com- pletely parasitical as our Cuckoo, laying one egg in the nests of various small insectivorous birds, which _ rear that young bird alone, so that the others evidently perish, even if not ejected; a fate which is likely to befall weak young birds in any case, as exemplified by my Canary experience. This is a glossy-black species with a sooty-brown head in the male, brown in the female, and used to consort with bisons when they were common, as it now INCOMPETENT COW-BIRDS 201 does with cattle, whence its scientific and popular Mamies. ike the rest ofthe genus, it 1s, chiefly - a ground-bird and a walker, so that in general habits it presents no resemblance whatever to the parasitic Cuckoos. In South America are found several species, and it is to the able historian of the birds of Argentina Mr. W. H. Hudson, that we owe the elucidation of their curious half-developed instincts. The best- known species, the glossy Cow-bird (Molobrus bonar- 1énsts), is very common and often imported here as a cage-bird; the male is a resplendent purple and the hen sooty. It is truly parasitic in that its young are always reared by other birds, but its parasitism is slovenly and incomplete. Several females will lay in the same foster-nest, and fairly swamp it with their undesired contributions, whereas it is rare in the case of the Cuckoo to find two parasite eggs inone nest. ‘To this suicidal instinct they add another equally silly, of destroying any sort of eggs they may come across, those of their own species included; and moreover they recklessly drop eggs about on the ground, a habit shared by another South American bird, the Rhea. And just as the hen Rheas are, so to speak, parasitic on their own males, and pool their eggs in his nest, so these hen Cow-birds occasionally make a futile nest of their own, in some silly place such as on the leaves of a large thistle, and leave even this poor attempt unfinished. Then there is a species, brown with chestnut i 202 BIRD BEHAVIOUR wings in both sexes (M. badius), which is also common, and is not parasitic, except to the mild extent of stealing another bird’s nest when it can; this species is itself parasitized by another (M.rujo-axillaris) in which both sexes are black. I particularize the colours of these species because it is interesting to note that the one with the simplest and probably most primitive coloration retains its primitive habits, and the most advanced in coloration is actually parasitic on this; a fact which, however curious it may. appear, is not so paradoxical after all, for allied species recognize each other’s affinity, and as long as a member of a parasitical group retained the ordinary nesting- habits of birds, it is, after all, at least as reasonable that a parasite should quarter itself on this as on an alien. ‘There is, however, no case known of a parasitic Cuckoo quartering its offspring on an independent one, although species of both types are habitually found in the same countries in the Old World. The one Cow-bird which penetrates into the northern half of the American continent is, like our exceptionally widely-ranging Cuckoo, a bird of extended parasitism, favouring various species of small Finches and insectivorous birds; with the Cat-bird (Galeoscoptes carolinensis), a larger species’ than most of its fosterers, it is seldom successful, and the Golden Warbler (Dendreca @stiva) some- times disposes of the Cow-bird’s egg, not by turning it out of the nest, but by building a fresh floor over THE DRONGO AND ITS MIMIC 203 it, and in the case of a repeated invasion by the parasite, may have recourse to this expedient more than once. Another case of parasitism, and in this case also on allies, is furnished by the Troupials, the large black Cassidix oryzivora, a bird about the size of a Jackdaw, being a parasite on some of the other ‘Troupials known as Hang-nests. Cow-birds do not mimic their dupes in appear- ance any more than Honey-guides; and indeed this resemblance to an alien fosterer only appears in one or two Cuckoos, and is doubtful there. One Eastern Cuckoo, indeed (Surniculus dicrurotdes), has been called the Drongo-Cuckoo, and attained a great celebrity in books and museums, owing to its resemblance to the common, conspicuous, and highly pugnacious black Drongo-Shrikes (Dicrurus), which it is believed to parasitize, though the chief evidence of this is that a pair of Drongos has been seen to kill one of these Cuckoos, which does not look as if the resemblance did much good to its possessor. The size and general shape of Drongo and Drongo-Cuckoo are certainly very similar, but after all there are plenty of birds of which this could be said; the black colour goes for nothing, as there are several other black Cuckoos, parasitic and otherwise, such as Cuculus clamosus allied to our Cuckoo, Coccystes serratus among the crested para- sitic Cuckoos, and the whole genus Crotophaga or Anis among the non-parasites. Moreover, the tail 204 BIRD BEHAVIOUR of the Drongo-mimic is only square or slightly forked, whereas the tail of the Drongo itself has an extra strong and deep fork with an outward turn like that of our Blackcock, so that these spirited Shrikes would have to be uncommonly bad observers not to detect the impostor at a glance. However that may be, the other case does not seem very much better; one of the Koels of the genus Eudynamis allied to the Indian Koel above mentioned lays in Borneo in the nest of a Talking Mynah (Eulabes), and the young of both sexes are said to be black, as males of this genus of Cuckoos always are, the hens being speckled like hen Pheasants. ‘This is supposed to deceive the parent Mynahs, which are black birds, while the Cuckoos are growing up, the hen getting her colour later on. Something similar has been said about the Indian Koel, which, as we have seen, parasitizes Crows, birds which are certainly more clever than. any Mynah; but as a matter of fact, in Bengal at any rate, young Koels do not resemble the male in all cases. Young cocks are black, indeed, but have some buffy markings, and young hens are almost as variegated as the old birds, equally so in fact save for a solid’black cap. It would surely be far more to the point for the hen to be like a Crow, so as © to approach the nest in greater safety, if evolution here were proceeding on orthodox lines. And as to the resemblance of the young to that of fosterers, the, Hawk-like young of other Cuckoos manage to A FUTILE RESEMBLANCE 20s get brought up all right, in spite of the absence of resemblance to the fosterers’ true young, and of the presence of a resemblance to the most hated and feared of birds. Resemblances to some other bird than a near ally seem to be a marked peculiarity of the Cuckoo family ; not only do some of the parasitic Cuckoos look like Hawks, and at least‘one, as we have seen, rather like a Drongo, but the largest of this type, the Channel-bill, is so like a Hornbill that it was early described as one—yet there are no Hornbills in Australia, where this bird occurs, and the nearest Hornbill, found in New Guinea, is not that which the Channel-bill resembles, the likeness being to some of the small grey Indian species. A parasitic Cuckoo may even resemble a non- parasitic one, as in the case of the crested Coccystes coromandus, which is coloured just like a non- parasitic *“‘ Crow-Pheasant ’? (Centropus monachus), though the former is Indian and the latter African, so that an excellent case of what is called in insects **Maullerian mimicry” falls to the ground. It would be just as well for parasitic Cuckoos if they did get mistaken for stronger birds, as they are often bullied, even by species which they do not infest, but from what has been said, there does not seem to be any really definite development of this mimicry in appearance. CHAPTER VII Migration—An anciently observed phenomenon still imperfectly understood—Reasons for it—Methods as far as is known— Difference between migratory species and the homing Pigeon —Widespread tendency to migration, contrasted with con- tradictory tendency to form localized non-migratory races, ending in some cases in flightlessness, as in some birds of remote islands Micration has always been a conspicuous pheno- menon in the lives of certain birds, and often, as in the case of Wildfowl and Quails, intimately bound up with the question of human food-supplies, so that it is a very familiar fact; but in spite of this familiarity, it is still far from being properly under- stood. The old idea of the hibernation of some birds is indeed definitely done away with, and nowadays no one seems to believe that small birds ever ride on big ones; yet Bee-eaters in Africa have been found riding on Storks or Bustards when these were searching for prey on the ground, and taking their share of the insects driven up; so where is the difficulty of a weary Wren or Warbler taking refuge on a Swan or Gannet, which certainly could not dislodge it in mid-air? I mention this ‘because there is no physical impossibility involved, 206 A MIGRANT IN MINIATURE — 207 as in the case of Swallows, which were supposed to winter under water, and the case is worth con- sidering. As to the reasons for migration, we have here some chance, when we know more completely the life-history of the birds, of finding them out; and at the outset, migration is in its essence simply the periodical removal of an animal from conditions which have ceased to be attractive to a locality where it is, or expects to be, more comfortable. It is not confined to birds, for some fish are well- known migrants—one has only to cite the salmon— and mammals also undertake migrations, as the American bison used to do, and as sea-lions do still. A very interesting case is that of a small and very local British land-snail (Helicodonta obvoluta), now only found here on a limited area on the South Downs, which executes a miniature migra- tion from its hibernating haunt on the ground to the branches of the beech-trees in spring, spending the summer aloft, and in autumn coming down the trunk to bury itself again. There is no essential difference between the short journey of this humble mollusc and the enormous transit of the world’s record migrant, the Arctic ‘Tern, which breeds up to the northern limit of land, and in our winter reaches, on its southern migrations, even to the cheerless shores of the Antarctic continent, there to enjoy whatever sort of summer that unpromising region can Offer if Migrations in elevation, made no doubt very 208 BIRD BEHAVIOUR often with little or no use of the wings in the case of ground birds, are quite the normal thing in hill- living birds, as in so many species inhabiting the Himalayas; the splendid Monaul or Impeyan Pheasant (Lophophorus refulgens), for instance, ranges up to the very edge of the forest belt in summer, and comes down in winter into the lower deciduous woods, where there is more chance of food. Wild Turkeys in America used to wander long distances in search of mast, acorns, etc., though their powers of flight are so limited that in crossing a river a mile broad, some of the weaker birds were certain to fall in and have to finish the transit as best they could by swimming, and it took days of gobbling exhortation from the old cocks to get the emigrants’ spirit up to the pitch of starting at all. Want of food is obviously the chief reason why * birds of high elevations or high latitudes have to leave their haunts; cold is by itself very little operative, for it is not surprising that birds prove comparatively indifferent to it, considering their naturally high temperature and particularly warm clothing. Not only do numerous tropical Finches and Parrakeets winter safely in outdoor aviaries, but of our poultry the majority come from hot climates, the Fowl and Peacock, for instance, being typical inhabitants of the plains and foothills of India. With the end of autumn, however, comes not only scarcity of food, but absence of cover, ‘ owing to the deciduous character of so much temperate vegetation, so that both for fear of BRAVING OUT THE WINTER 209 getting nothing to eat and of becoming food for others, the birds of temperate climates have to seek a warmer country for the winter. Species whose habits render them independent of leaves and herbage and fresh water tend to be resident; thus, the Eider-Duck and Razor-bill Wwilliwinter on the edge of the Arctic ice, and Woodpeckers and Tits,.whose food is sought on boughs and trunks rather than on leaves, can pass the winter in leafless forests that Warblers and Cuckoos must leave, while the Grouse feed on conifer-needles and buds or burrow in the ‘snow for their food. Berry-eating birds like Thrushes can live till the supply is gone, and a confirmed berry-eater, the Waxwing, roves about the north all winter, its long wings, almost Swallow- like in form, giving it ranging powers that enable it to dispense with a distant southern journey in many years, though it may even reach Northern India. Some birds of prey, too, remain even in the high north as long as there is anything to be picked up, such as the Snowy Owl, though even this has strayed south to the Punjab. The universality of the migration depends of course on local conditions; thus in the compara- tively mild climate of our islands many species are to be seen throughout the year which are migratory in corresponding latitudes on the Continent, the Robin and Song-Thrush for instance. Swallows _ often remain after their time of leaving, and, as Gilbert White observed, they stay particularly late 14 210 BIRD BEHAVIOUR about Oxford, and I have been the unwilling witness of the gradual failure and death, evidently from hunger, of some of these poor would-be colonists in permanency. | Birds of passage in the Southern Hemisphere naturally migrate north in winter, from the same motives as induce the northern birds to go south, but there is a curlous exception in the case of the Emperor Penguin, which chooses mid-winter in its haunts on the Antarctic ice-floes as the time for laying and rearing its chick. Some other birds, too, seem to come into breeding condition at most unlikely-seeming times, for the fragile little Sun- birds in some cases breed in high mountainous parts of South Africa in winter when the snow lies quite deep under their hanging nests. Besides the direct north and south migrations also, there are cases where the migration is rather from east to west, as in the cases of the White-eyed and Red-crested Pochards (Nyroca africana and. Netta rufina), whose chief winter haunt 1s in India, though their breeding-range extends not only into Central Asia, but far west into Europe. The Rosy Pastor presents the unusual case of a bird which has a fixed wintering station in the east, and a pronounced westerly migration, but no definite breeding-haunt; for these birds in winter are essentially Indian, but breed in Western Asia and Eastern Europe, but in different places in different years, the flocks, which keep together even in the breeding-season and nest in company, LIFE ON THE EASTERN ISLES 211 settling down to breed irregularly in different spots, being guided apparently by the abundance of the locusts, which form a favourite food. In the East Indies there are curious cases of inter-insular migration in at least two Pigeons, the ground-feeding Nicobar or Hackled Pigeon (Calenas nicobarica) and the arboreal Pied Fruit-Pigeon (Myristicivora luctuosa), which wander far and wide in the many islands of the Indian Ocean, but do not come to the mainland. ‘The case of the Nicobar Pigeon is particularly remarkable, as only scattered pairs are found breeding elsewhere than on Batty Malve, a small and fortunately very inaccessible islet in the Nicobar group, which appears to be a perfect Pigeon-house during the season when the birds rear their single chick. This regular return to isolated spots in huge numbers is almost unique in a land-bird, but, as is well known, quite acommon thing among sea-fowl, especially Petrels and Penguins; it was only com- paratively recently found out where one of the com- monest and most widespread among southern ocean Petrels, the well-known spotted ‘‘ Cape Pigeon ”’ (Daption capensis), nested, the locality being Ker- guelen. Wilson’s Petrel (Oceanites oceanicus) also nests in Kerguelen, and spends the southern winter ‘in the north, affording a rare instance of a southern- breeding bird crossing the equator, though it is quite the usual thing for migrants from north to south to go far south of this line. It has, indeed, been found that of migratory Ps 212 BIRD BEHAVIOUR groups, the species which go farthest north to breed often winter farthest south, as exemplified among the Swifts and the Turtle-Doves; among Ducks, too, the arctic-breeding Pin-tail and Wigeon go farther south than the temperate-zone-haunting Mallard. None of the Geese, however, which mostly breed in the high north, go very far south. Many naturalists seem puzzled as to why birds which have escaped starvation by going towards equatorial lands should retrace their course again to the countries they have left ; but this is because they have generally little practical acquaintance with any but the birds of the Northern Hemisphere, where only, in Europe and the United States, do ornithologists much abound. ‘To any one who knows the tropics, the problem does not seem so wonderful. In the less well-watered parts of these countries, the heat of the hot season produces effects not so very different from the frosts of the temperate winter. Herbage and leaves are parched up, with the result that both insect and vegetable food become scarce, and the water supply is much restricted. Under these conditions reptiles, frogs, and even fish ‘ zstivate,” z.e. go in for a summer sleep, in the case of the aquatic creatures burying themselves in the mud, and native birds of aquatic habits have to leave these districts for better- watered ones. Obviously, then, the migrants are no better off, and have every reason to get out of a country in which the residents have all they can do to survive. HEAT AND ITS INFLUENCE — 213 The heat itself may have something to do with making them leave, although on the whole birds from temperate countries or of mountaineering habits seem to bear heat as well as tropical resi- dents, judging from what I was able to observe at the Calcutta Zoo. This is a most remarkable fact, considering that the very peculiarities of birds I alluded to above as fitting them to withstand cold are just those which ought to make them susceptible to heat ; and it is a curious fact that the warmly-clad Duck tribe bear heat, even when migrants from the north, particularly well, while the thinly-clothed _ Pheasant family are more susceptible than any other birds ; the Monaul bears heat worse than any bird I know, panting in a temperature which provokes no such manifestation of oppression from any other bird. Among the Pigeons, too, I noted the Hima- layan Snow-Pigeon (Columba leuconota) showed no distress at the heat, although a high alpine bird, while some of the warm-climate-dwelling fruit- Pigeons were obviously affected, as were many Parrots. Crows also feel heat much, even tropical species like the Indian House-Crow, and the House- Sparrow, although it lives well through both heat and cold, pants constantly in the Indian summer, while the imported Goldfinch seems quite indifferent to heat. | It is noteworthy, too, that while the Mallard in its wild state does not visit the tropics except on its southern migrations, its descendant, the domestic 214 BIRD BEHAVIOUR Duck, lives and breeds well there, the most spe- clalized of all its breeds, the Penguin Duck— apparently the ancestor of the so-called “‘ Indian ” Runner, so deservedly popular nowadays—being characteristic of the Malay Islands, so that, though . even in this country young Ducklings are found to be very intolerant of heat, it must have been long and perfectly acclimatized in the East; and many of the migratory Ducks I watched in confinement in Calcutta showed distinct signs of wishing to breed. On the whole, then, there is little evidence that the direct effect of heat itself has influenced the spring-time ebb of bird-life away from the tropics ; but its indirect effects, as hinted above, are another matter, and apropos of this it may be noted that in the Bombay famine of a few years ago the game-birds, which could not migrate, suffered and died just as if they were mammals, while better flyers escaped. Then there has to be taken into consideration the attitude of the bird-population of the tropics themselves. It is true that this is so numerous and varied that the huge tidal wave of migrants -from the north into India makes no more obvious difference to the human observer of the bird population than does the influx of the football crowd into London on the occasion of the great Cup-tie contest to the apparent fulness of the © metropolis, and no doubt things are much the ~ same elsewhere. . PRESSURE FROM RESIDENTS — 215 But birds, like savage tribes and civilized nations, have boundaries to consider, and if they invade the territories of others, must sooner or later have to fight for a place or return whence they came. And in such a contest, which must be inevitable in the tropics when food and favourable locations get at all scarce, the advantage is all on the side of the residents, which are generally speaking birds of a superior type mentally and morally, even when less specialized physically, and perhaps, indeed, on that very account. ‘They generally excel the birds of temperate regions in courage, social instincts, and intelligence, as is shown by their much greater power of combination, and by the far superior nests they often build. Finches of the typical temperate-zone groups have a poor time in an aviary if crowded along with Weavers, and the Tree-Ducks know how to make the migratory temperate-zone Ducks respect them, while the solitary Thrushes would have a poor chance against the Babblers, with their powers of combination which enable them often to resist even Hawks. There is a popular belief that birds in temperate climates sing better than in the tropics, but all the foundation for this idea is the fact that the Nightin- gales are birds of the temperate zone, and that some very common ‘Thrushes are good singers ; with the exception of the Nightingales no singers of the north of the Old World can surpass, or even equal, the Shama (Czttocincla macrura) and Orange- headed Ground-Thrush (Geocichla citrina) of India, 216 BIRD BEHAVIOUR and in the New World the Mocking-birds (Mimus) are essentially southern, though the most celebrated (M. polyglottus) ranges into the northern states. The only point in which the birds of temperate climates really excel the tropical forms is in power of flight, which they have had perforce to cultivate, and even this superiority is not universal, for there are some of the most magnificent flyers among the Parrots and Pigeons, which are essentially tropical to say nothing of Frigate-birds and Tropic-birds. In addition to influences of ‘this kind, which are operative on young and old birds alike, there is the instinctive attachment to the breeding-place, which ~ 1s so strong in birds that they have often been recorded as returning to it for many years in suc- cession. ‘This of course must act to a certain extent on the old birds, and even the young, if at all uncomfortable where they find themselves by the time they complete their first year, are most likely to come back to the place which gave them birth, and where they had their first insight into the enjoyments of flight and independence. The main point about migration, therefore, is the fixing of the methods, not the motive; and it is here that we are confronted with problems difficult to solve. The case of the Homing Pigeon ought to give us some help, but such Pigeons are ~ well known to be guided almost entirely by sight, and to need training by gradually increased stages ; whereas birds of passage frequently, perhaps most commonly, fly by night, and, in the autumn migra- a THE HOMING INSTINCT 217 tion, the young often leave the land of their birth before the adults do. A converse case of juvenile independence is that of the common Cuckoo, the old birds leaving us in July, while the young remain till the general southward movement of migrants in September, long after all old Cuckoos have left us. _ That many birds have some method of correctly directing their course without the aid of sight is shown not only by the night-flights of many, but by the return of Penguins to their breeding-grounds, unable as they necessarily are to take a wide survey, owing to their flightlessness; by the return of - Noddy and Sooty ‘Terns to their breeding-places in the Southern United States after they had been taken away and released hundreds of miles north of their range, and by at least two instances of flying birds taking the correct direction on foot when deprived of the power of flight, that of a Canada Goose recorded by Audubon, and of an Upland Goose cited by Mr. Hudson—though in the latter case 1t must be admitted that the bird’s full-winged mate was with it. These cases are, however, par- ticularly interesting in that in the former the bird’s spring destination was north, and in the latter south. In England, also, a cock Reeves’s Pheasant, released thirty miles away from home, was found next day perched on the aviary in which he had been bred. There is undoubtedly a great deal of more or less random movement, especially in young birds ; 218 BIRD BEHAVIOUR such are particularly apt to appear in localities not normally frequently by their species, as I found in the case of the invasion of India in the late ’nineties by Baer’s White-eyed Pochard (Nyroca baeri), most of the specimens | obtained being young birds. ' Birds also often range for a time north of their breeding-haunts in autumn, and may even fly out into the Atlantic from our coasts, only to perish or come back utterly exhausted. There is thus a good deal to be said in justification for the statement that young birds “* wander almost at random,” and that most of them are probably destroyed before the next spring; and the dangers of a long migration may be the chief reason why birds are more numerous, but less fertile, in the tropics, where there is not this wholesale risk to be faced annually. Of course there is a good deal of local movement even in the tropics, but not much is known about this as yet, and the nai are inevitably far less risky. It has been pointed out that the reason why day-birds so often migrate by night is that by so doing they utilize hours which would in any case have to be spent without food, and thus economize time and strength; but the ever-present danger of Gulls, Carrion-Hawks, and Crows, some or other of which are always to be found along every coast, all on the alert to note signs of weariness in birds they ordinarily would have no hope of capturing, must surely have something to do with this, and it is to be noted that in all groups the larger or RELINQUISHING TRAVEL 219 more powerfully-flying species are more inclined to day migration than the feebler folk; thus, Crows and Swallows among the Passerines, and Geese and Swans among the wildfowl, migrate by day, as do Hawks, Storks, and other powerful and predatory birds. The tendency to migration is nearly universal among birds of temperate zones; even, as re- marked above, in species not usually thought of as migrants, because always visible at any time of year in our country at least; the most thoroughly sedentary of flying birds being the Game-birds and Woodpeckers, which have special facilities for finding food, though even of these some migrate, such as the Quail and Greater Spotted Woodpecker. On the other hand, there is a strong tendency for migrants to settle down and form non-migratory local races; thus, most of our resident British birds are recognizably different from the conti- nental individuals of the same species which visit us, and are nowadays distinguished as local races or sub-species ; and we may notice that the Blackbird shows a much greater tendency to become per- manently resident in the north than the Thrush, a weaker and less versatile but more strongly-flying bird. The Quail, one of the most anciently-known migrants, often used to pass the winter here when it was commoner, and conversely has been known to breed in numbers in India, usually only a winter- resort, while it has established resident races in Spain and in the Canaries, although attempts to 220 BIRD BEHAVIOUR introduce it artificially into the United States have failed. This tendency to settle down and have done with the fatigues and dangers of migration has resulted in the production of many localized and often insular races of birds, which have often become flightless, where flight was of little import- ance in their daily life; thus we had the Great Auk in the north, formerly a most abundant bird, and in the Galapagos there has been discovered of late years a flightless Cormorant (Nannopterum harrist), and on the elevated Lake Titicaca in the Peruvian Andes there lives a flightless Grebe (Podicipes micropterus), such a lake being the bio- logical equivalent of an oceanic island. . Such flightless species are to be found most com- monly amongst the Rails, birds which migrate a good deal, but are nevertheless poor flyers as a whole, and always more ready to use their legs than their wings; they also have a most peculiar pro- © pensity for turning up in the most out-of-the-way places, being probably unable to make head against a wind, while their power of swimming enables them to rest on the water and gain fresh strength where others would drown. The widest migrant and most succesful bird of all is the little unspecialized Turnstone, which is to be found on all shores in the world at one time or other of the year, and is strongly sus- pected of having established; breeding colonies far and wide in the world, though its main haunts THE SUCCESS OF THE TERNS 221 in the nesting-season are undoubtedly in the north. When we come to consider groups, however, the palm for success in the struggle for existence, as evidenced by wide distribution over the world, must be awarded to the Terns, a very highly specialized group in structure, exaggerating the points of their more generalized family relations the Gulls. Gulls go nearly everywhere, but are much rarer in or near the Tropics than in colder regions, and rarely breed there, and are absent altogether in the Central Pacific. But you cannot go anywhere without meeting ‘Terns, not only in remote islands, but in the interior of great continents, for there are many freshwater species. Those curious exaggerations of the Tern type, the Scissor-bills (Rhynchops), with the “ under- shot’ beak with which they plough the water for small fish, are all warm-climate birds, but the few species between them extend all round the world. Although there are no islands too distant for such birds as these—and of course the oceanic Petrels—to have reached, there are some which are too out-of-the-way for any land-bird. When Mr. W. L. Sclater was sent to investigate the birds of the Chagos Islands, a small group in the Indian Ocean, he found no land-bird there except the little Scarlet Weaver (Foudia madagascariensis), a most obvious human introduction ; and on Easter Island, although a small land-bird has been re- ported, it has never been brought to book, and 222 BIRD BEHAVIOUR the Tinamous found there have been introduced from Chile. | In Hawaii, too, the Kingfishers and Pigeons and Parrots, which are elsewhere most widely spread in the Pacific, are wanting, though a Chinese Turtle- Dove (Lurtur chinensis) has been successfully intro- duced, as also has an Australian Parrakeet, the Mealy Rosella (Platycercus pallidiceps), the original stock in the latter case being but a single pair. This being so, it is a great pity that a pair of the common Belted Kingfisher of North America (Ceryle alcyon) were shot on arrival, as they might also have found a footing, and this natural intro- duction of a new form would have been most interesting to watch. The irruption of even a large number of new birds, however, does not neces- sarily always mean success, as in the case of the failure of the well-known repeated attempts of hordes of Pallas’s Sand-Grouse to colonize Western Europe, where they hatched young even with us. An interesting example of successful emigration, and that by a bird which nowadays very rarely migrates at all, is furnished by the career of the Magpie, a bird whose unique and conspicuous appearance and—where it is not persecuted—its abundance and familiarity, have always made it one of the best known of birds, as the many stories and superstitions relating to it abundantly testify. It is very doubtful if this bird was known to the ancient Greeks, for no species mentioned in their writings can be definitely identified with it, unless THE MAGPIE’S ODYSSEY 223 it was the ‘‘ Lycian Daw ” of Aristotle, which is not described, but merely mentioned by name among other ‘* Daws,” in his work on the “ History of Animals.”” The bird the Greeks called Kissa or Kitta, which some scholars have taken for the Magpie, was evidently the Jay, since Aristotle _ mentions its characteristic habit of storing away the acorns, and in enumerating the various species of Thrushes compares the Missel-Thrush to it in size, a comparison for which the Magpie would be obviously unsuitable owing to its long tail. The Pica of the Romans, from which word the French and English “‘ Pie” is evidently derived, was also the Jay, for here again the acorn-eating habit is mentioned by Pliny, who also speaks of his Pica, as Chaucer, so many centuries later, mentions the Jay, as a bird kept for talking. The Roman naturalist also gives us a definite clue to the extension of the Magpie’s range in his time, for he says that of late years a new sort of Pie (Pica) had appeared in the neighbourhood of Rome, noticeable for its varied (or pied) colouring and long tail. Many centuries later we have a definite historical record of another westerly irruption of Magpies, when about the year 1676 a flock of about a dozen is stated to have arrived in Wexford—the ancestors of the numerous Magpies which now form so noticeable a feature in the bird-life of Ireland. That they did not inhabit that island previously is known from the “Itinerary”? of Fynes Morison, who expressly notices their absence in 1617. 224 BIRD BEHAVIOUR As the Magpie is found in Western America and all along the width of Asia in the north, it would seem as if it were originally an American bird which has in the course of thousands of years been moving continually westwards, although on the other hand the American birds may be a colony which crossed Bering Straits in the opposite direction to found a colony in the New World, as the Alaska Wheatears are doing, in which case we might look to Central Asia as the cradle of the Magpie race ; it stands so much alone in the Crow tribe that it has no near relatives to give us a clue. CHAPTER VIII The senses of birds—Sight and its general high development— Degree of perception of colour—Influence of colour, if any, on courtship, and the segregation of species—Perception of the colour in various kinds of food—Smell, usually poorly developed—Exceptions noted—Acuteness of hearing—Sense of touch—Taste-perceptions. Tue senses of birds are nearly all well developed, though the mechanism of the sense-organs is some- times much less elaborate than in the case of mammals, an important instance of the want of correlation of structure with function. In power of sight they, as a rule, surpass all other animals, this being the dominant sense in all birds except the Apteryxes or Kiwis of New Zealand, which see very badly, not only in the day, when they are naturally at rest, but even at night, when they will walk right up to a person when at large, and show no alarm when a white handkerchief is waved at them when in captivity. There is a possibility that there are great differ- ences in the powers of distant sight of ordinary birds, but there is little or no evidence so far. on thishead. Macgillivray ‘has indeed suggested in his book on British Birds that the Sparrow-Hawk is 15 225 226 BIRD BEHAVIOUR short-sighted, because’ he had observed it does not seem to see birds in a hedge at a hundred yards’ distance, and does not attack except at a range of a few yards. ‘The obvious criticism on this, how- ever, is that the Sparrow-Hawk, like other birds of prey, does not waste time and strength in attempt- ing attacks which have no reasonable prospect of success ; its strategy is mainly one of surprises, for though capable of very great speed for a short dash, it is not suited for a long pursuit. It there- fore pays no attention to birds which it does not consider favourably placed for attack. I have seen behaviour in Kites in Calcutta which exactly suggests this. The Kite has no speed at all, but can execute a very successful surprise stoop, snatching food even from a man in a most disconcerting manner. I have seen one of these birds, passing with the slow flapping flight which it employs when travelling at a low elevation of about the height of the house-tops, evidently meditating an attack on a Dabchick and her young on the Calcutta Museum tank. The thought in the Kite’s mind was obvious, as it hung on its wings for a moment over the little group; but “ chip, chip,” went the Dabchick—which ordinarily never bothered about Kites—beginning to ‘‘ go down by the bows ” in preparation for a dive, her downy young imitat- ing her, evidently reading the enemy’s intentions ; and the enemy’s comprehension of the hopelessness of the situation was equally complete, for the polsing was but momentary, and the Kite flapped THE VISION OF VULTURES — 227 on again, knowing that before its stoop could reach the water the quarry would be under it. Only occasionally were such very faint attempts made, the numerous Kites knowing full well the uselessness of attack, and this no doubt explains why they never carried off the sitting Dabchick or her young when resting on the very exposed nest. One I bought in the bazaar and threw up near the pond, failing to get under way and falling to the ground, was instantly snapped up by a Kite within afew feet of me. A dead Sparrow was also instantly picked up, though live ones were not chased; yet a released cage-bird, if at all weak on the wing, was instantly pursued. The sight of the high-soaring birds of prey is supposed to be particularly fine, and certainly Vultures seem to be able to perceive a dead animal when themselves out of human sight, though of course they are often guided to their prey by observing the movements of others floating at a lower elevation, or of lesser scavengers such as Kites and Crows, flying near the earth. In this connection it is interesting to note that the eyes of most Vultures are small compared to those of Eagles, and are not overhung by a bony brow, perhaps because less exact observation is necessary in their case; but in the ordinary way, size of eye seems to have no more to do with power of vision in birds than in man, the usually small- eyed Ducks and Geese being to all appearance quite as quick-sighted as any other birds. Nor does ~ 228 BIRD BEHAVIOUR there seem to be any connection between colour of iris and visual powers, both Owls and Hawks, for instance, being found with either dark or yellow eyes; this is, of course, not surprising, as the iris itself plays no direct part in vision, but some correlation might have conceivably existed. That some birds have powers of sight surpassing those of man is known from the use of the Great Grey Shrike by the Hawk-catchers at Valkenswaard in Holland, who are informed by their tethered Shrike of the appearance of a bird of prey before they could see it themselves, and when nearer, of its character, whether Harrier or Buzzard on the one hand, or Falcon or Goshawk, by the degree of agitation shown by the sentinel. The Indian Roller (Coracias indica), too, sitting lazily on a telegraph wire in the glare of the Indian sun, perceives and flies down to an insect or other small prey at a distance at which human eyes would certainly not perceive such an object; while many must have wondered how a Kingfisher, or even more a Gannet, discovers a fish and is able to judge its distance from the surface sufficiently well to make a successful swoop. It must be admitted, however, that the Kingfisher at all events makes at least as many misses as hits, not having so much judgment as some of the birds of prey I have been mentioning ; and, speaking of most birds, they do not behave as if their power of sight were any better than our own. Diving-birds, however, may enjoy better sight SIGHT OF OWLS IN DAYTIME 229 under water than we do; at any rate it is interesting to note that just as we use a water-glass to examine the bottom, so do Grebes and Cormorants often put their head under water to beyond the eyes before diving to get a clear view. ‘These hunters under water can, however, generally see as well in the air as any ordinary birds ; in fact, those I have mentioned, and such diving-ducks as Golden-eye and Mergansers, are notoriously very wary and alert birds. Penguins, however, are suspected of being short-sighted when out of water. The powers of night vision which Owls and » Nightjars possess, also, do not seem to interfere with their vision by day, the idea that they are dazzled by daylight being solely due to the fact that they are unwilling to move in the day. When they are actually on the wing, they fly well enough and avoid dangers and obstacles quite successfully, and in captivity they show interest in birds flying over, and even bask in the sun. In the case of Owls, the curious peering movements of the head certainly give the idea of bad sight, but these gestures are indulged in just as much in the dusk of the evening as in daylight, being merely a trick of habit ; indeed, something similar is seen in the more jerky head-movements of the Hawks. The blinking of the upper eyelid in Owls is also a very human action which may have helped to suggest the idea of blindness in daylight, almost all other birds winking with the inner or third eyelid, which is drawn so rapidly across the eye. 230 BIRD BEHAVIOUR that it does not interfere with the gaze, and Is hardly noticed by the onlooker. ‘The Dipper, or Water-Ouzel, also blinks the upper eyelid like an Owl; the reason of this seems obscure, since other birds that hunt under water do not do so. Nor, as far as that goes, do all Owls hunt at night; many, such as the Snow Owl, Hawk-Owl, Short-eared Owl, and Burrowing Owl and some others, hunting either by day or by night, while the Little Owl and Indian Little Owl (Athene noctua and A. brama) come out while it is still daylight ; in India I used to notice the latter out at about five o’clock in Dehra Dun, while in Cal- cutta they did not show themselves till nightfall, no doubt owing to the hostility of the numerous Crows, for I have seen a homing Crow swoop at an Owl which had appeared a little too soon. There are also some Nightjars which hunt by day, such as the- American Night-Hawk (Chordeiles popetue), which is often abroad high in the air in bright sunlight. Woodcocks and Snipe, which are usually night-birds, may also feed by day. Conversely, many of the birds which have no special adaptation for night vision often fly and feed at night, such as many members of the Duck and Plover tribes, especially the common Lapwing and Mandarin Duck, whose unusually large eyes may, however, be an adaptation to these habits. Certainly the last-named bird, in spite of his gay colours—such being almost unknown in true noc- turnal birds, which are sombre like mammals—is, PEAHEN AS ADVENTURESS 231 judging from its habits in England, quite as noc- turnal as some of the Owls, not stirring much before noon, while the trampled ground in any small enclosure in which specimens are kept shows that they run about much at night. Most Ducks, when free from human persecution, are certainly inclined to diurnal habits to a greater _ extent than their behaviour where sought by sports- . men would indicate, and M. Rogeron says that their night-vision appears to be no better than our own, judging from the way in which they will fail to see bread thrown to them at dusk. But as they generally fly in the open and feed much by feeling, this is no great drawback. The ordinary day-birds certainly are just about as much at a loss at night as we are, and can avoid danger just about as much. Game-birds are gener- ally particularly helpless at night, as we see in the case of Fowls and Pheasants; but Peafowl are far more alert—I have known a Peahen which had escaped from the former trading menagerie at Covent Garden remain at large for months, in spite of attempts at nocturnal surprises. ‘The Quail appears to be even actually semi-nocturnal, for in captivity it freely moves about at night; one I kept loose in a room was quite quiescent by day. The Lineated Pheasant of Burma (Genneus lineatus) has also been observed coming out into forest clearings on moonlight nights. Although Parrots are mostly diurnal birds, there are some as nocturnal as Owls, such as the great 232 BIRD BEHAVIOUR flightless Owl-Parrot or Kakapo of New Zealand (Stringops habroptilus), and the small, flying, but otherwise very similar Night-Parrakeet of Australia (Geopsittacus occidentalis); and the sheep-killing Kea seems to be active indifferently by day or by night, which is one reason why its attacks on the sheep are so hard to guard against. Lord ‘Tavistock has also noted recently that an Australian Black Cockatoo which he had flying loose about the park at Woburn was often on the wing after dark, though of course mere flying after dark does not necessarily indicate nocturnal habits, as so many migratory day-birds fly at night. The New Zealand flightless Rails or Wekas (Ocydromus) are active by night as well as by day, and ordinary Rails are great night-fliers. Swifts are said often in hot weather to soar up and stay aloft all night. Herons often move and feed either by day or night, and Bitterns and Night-Herons (Wycticorax) ‘ are true nocturnal birds; I noticed, however, that in our colony of the common Night-Heron (NV. griseus) at Calcutta, the birds did not seem to sleep much during the day; but the same thing can be said of most Owls, only the Barn-Owls being generally really asleep in the daytime, if one may judge from their behaviour in captivity. Petrels are nocturnal at their breeding-places, probably from fear of Gulls and Crows, for out at sea one sees them flying freely by day in the hottest sun; I have even seen a Storm-Petrel and a Clouded Yellow butterfly flying within a few yards of each other, RECOGNITION OF COLOURS 233 Just as Macgillivray suggested the Sparrow-Hawk was short-sighted, so Professor Newton, in his “‘ Dictionary of Birds,’ remarks, with reference to the easy-going way in which the Hedge-Sparrow accepts an alien egg, that for all we know to the contrary it may be colour-blind; and within the last few years, a fancier writing to the Feathered World about Homing Pigeons has said that though they can distinguish black from white, this is not, the case with colours. The possibility of some birds not seeing as we do must therefore be borne in mind, but as regards the class as a whole the general evidence certainly tends to bear out the commonly accepted idea that their vision for colour is the same as our own. This is shown in several ways; for instance, they recognize colour in other birds, and display either © friendship or hostility in consequence, according to whether they are at the time in need of com- panionship or in a position to feel jealousy. Birds _ which are normally spiteful, for instance, are likely to attack a species which bear colours reminiscent of their own; thus Jenner Weir told Darwin of a case in which a Robin in an aviary killed a red- breasted Crossbill and injured a Goldfinch; and an American Indigo-bird (Cyanospiza cyanea) at- tacked a Nonpareil (C. ciris), which has a blue head, and nearly scalped it. I have myself seen a mated Blue Australian Wren (Malurus cyaneus) in one of the Zoo aviaries furiously pursue a cock Yellow-winged Blue Sugar-bird (C@reba cyanea), ee 234 BIRD BEHAVIOUR which it certainly would have hunted to death had not the keeper removed it ; and the Green Cardinal (Gubernairix cristata) has a bad name among fanciers for spitefulness to birds of similar colours. I have above commented (Chapter V) on the alarm shown by birds at the sight of young Cuckoos, though it may well be pleaded that as the pattern is the striking point here, the evidence is not necessarily in favour of colour-vision; nor need colour-vision to be postulated to account for terror which the mixed birds in the Western Aviary at the Zoo have shown in my presence at the Grey Touracou (Schizorhis concolor), or the Parrots in the large Parrot Aviary at the dark-slate Vasa Parrot (Coracopsis vasa), both birds of colora- tion which, although uniform, is met with in some birds of prey. I have witnessed sympathetic attraction of colour, or at any rate markings, when in Calcutta I turned a specimen of the Silver-eared Mesia (Mesia argentauris) into a large flight-cage with a mixed collection, and saw that it at first associated with the Black-capped Sibia (Malacias capistratis) and White-eared Bulbul (Molpastes leucotis), before finding out its really near relative, the Pekin Robin. The House-Crows in Calcutta used to get very excited when they saw a live or dead bird handled which showed much black or dark colour, using the same cries and gestures as they employed when seeing one of their own kind handled; I have seen this when the subject was a Muscovy Duck, a MISPLACED GENEROSITY 235 cock Amherst Pheasant, and even a Drongo-Shrike, the sworn enemy of Crows. Here there is a case of sympathy aroused by colour, but as in the above case, no proof of perception of anything but light and dark shades. The old cock-fighters used to object to a hen- feathered cock in the pit, owing to the fact that the opponent of such a bird was likely to mistake it for a hen, and so allow it an advantage while courting it; this might argue a perception of colour on the part of the Fowls, as the distinctive orna- ments of the cock—large comb, long hackles and sickles—were shorn before the fight, so that only the colour would be left to differentiate between the sexes. But it must be remembered that the pattern of cocks and hens is also generally very different, the upper and under surfaces of the former sex presenting marked differences in all except uniformly coloured varieties, which were rather rare in the pit game-fowl. The preying relations of birds to warningly coloured insects, to which I devoted much attention in a long series of experiments made during my residence in India, and published in the Fournal of the Asiatic Society of Bengal, showed, in my opinion, distinct colour-perceptions in the species I employed for experiment, since these generally preferred more plainly coloured butterflies to the ‘‘ warningly coloured” Danaids (Danais chrysippus, genutia, and limniace, and Euplea core), and the still more striking ‘“‘ warningly coloured’? white 236 BIRD BEHAVIOUR Delias eucharis and swallow-tail Papilio aristolochia, and of these only the two first species of Danats mentioned were at all like each other in colour, though I must admit that they could all have been distinguished by pattern also. The common Babblers I worked with appeared to be deceived by the resemblance of the female Nepheronia hippia to Danats limniace, though this is not very exact; and two species of Drongo Shrike by the resemblance between the swallow- tail above mentioned and the mimicking form of another species (P. demoleus) which is extraordinarily like the very unpalatable aristolochie except in having the abdomen black like most of the wings, instead of scarlet like the spots on the hinder pair of these, a distinction which was not so conspicuous in life as it sounds in print. The intelligent little Pekin Robin, however, was not to be deceived by this very close mimic, but it was taken in by the extraordinarily perfect resemblance of the female Hypolimnas misippus to Danais chrysippus, a re- semblance which is one of the “‘ show horses” of the theory of warning coloration and mimicry, and usually deceives human entomologists if un- prepared for it. | Speaking of birds’ mistakes, I once saw a very © amusing one made by a cock Sparrow in Calcutta, which flew down and picked up what he evidently mistook for a beetle, the creature really being a very small specimen of the local toad (Bufo melano- stictus) ; and from the movements of his bill after ONE EXPERIENCE ENOUGH 237 he had, immediately, dropped it, he certainly would have “pulled a face” had his features admitted of it. Such an instance enables one to see how very advantageous the acquisition of “‘ warn- ing colours’? might be to a nauseous animal, saving it from some experimental tasting ; but unfortu- nately for the theory, toads, and several other animals with repellent attributes, have been singu- larly unsuccessful in evolving such patterns. The mere possession of a striking pattern of thecon- ventional ‘‘ warning ’’ type does not prevent experi- mental tasting by novices; my birds often tried an insect they afterwards refused, and a very interesting case of this occurred with a Starling (Sturnus vulgaris menzbiert), which is only a winter migrant to India, and probably knows little of the taste of Indian butterflies. I offered this bird one of the _ black-and-scarlet swallow-tails above-mentioned, which was immediately gulped whole with charac- teristic Starling greediness. But next day another was not even touched, at which I was not surprised, as this butterfly is so objectionable to birds that often they will not even kill it. So the lesson was well learnt, and such lessons may be long remembered ; to a Starling I kept in England, which, when I bought it, had been kept for months in close captivity, and had had nochance of seeing caterpillars, I offered those of the buff-tip moth (Pygera bucephala), well known to be un- palatable to birds, and distinguished by a striking black-and-yellow chequered coloration; the bird 238 _ BIRD BEHAVIOUR simply turned them over with its bill in search of something better beneath, as if they had been so many ends of string or bits of stick, while when I had offered it a much larger green caterpillar on a twig it ravenously tore it from its hold and devoured it. This experiment, by the way, wants repeating under circumstances fairer to the caterpillar, though as a matter of fact I was not trying to find out if the bird would miss the insect owing to its protective coloration, as I have once seen a green lizard do. That is to say, if the power of a bird to see through a protective disguise is to be tested, the insects should be 1 sztu beforehand in a place to which the bird is admitted without having been allowed to see the preparations and so have its expectations raised. Until it is experimentally proved that birds overlook insects of. protective appearance in their natural environment, we are not justified in saying that such appearance is of any survival value as far as feathered enemies are concerned. In the case of birds of prey there happens to be some evidence of the valueof protective resemblance; a tame Peregrine Falcon flown at a Houbara Bus- tard (Houbara undulata) has been seen, when the quarry had settled and squatted, to alight and search all round on foot without success, and Lloyd, an excellent observer, says in his ‘‘ Wild Sports in Sweden ”’ that the Swedes when trapping for Hawks use a light Fowl, Pigeon, or what not for bait in ordinary weather, but a dark one if NO COLOUR-LINE OBSERVED = 239 snow is on the ground. Moreover,Mr. J. G. Millais in his “‘ Breath from the Veldt”’ describes how the Bateleur Eagle (Helotarsus ecaudatus) often captures prey owing to its habit of scanning the ground behind as well as before it as it soars, other Eagles passing straight on and missing prey which has squatted on their approach, only to get up and _move directly they have passed. In all these cases, however, we must remember that immobility may be a more important factor than colour. With regard to the fruit food of birds, it is to be noted that they eat red currants sooner than the white variety of that fruit, but colour may not decide this. Whatever attention birds pay to the colour and pattern of their prey or foes, they seem singularly Imattentive to it as regards recognizing their own racial affinities, for the theory of recognition-marks, which supposes that species of birds which are closely alike except for colour and pattern are aided in selecting partners by such differences, is not borne out by facts. Whenever the difference between two forms is so slight that colour, not structure or note, 1s the only distinction, the birds themselves disregard it, no matter how glaring the difference may be. This is best known in the case of the Hooded Crow and Carrion Crow (Corvus cornix and C. corone) in the case of our own fauna; these birds seldom breed in the same district, but when they do they frequently cross, and the same is the case with these 240 BIRD BEHAVIOUR species where they meet in their breeding-range outside Britain, as in Central Siberia. Here also our Goldfinch breeds and interbreeds with the Grey-headed Goldfinch of the Himalayas (Carduelis caniceps), a bird provided with excellent recognition marks. Actual specimens illustrating these points can be seen in the Entrance Hall at the South Kensington Museum. American naturalists will recall the case of the Red-shafted and Yellow-shafted Flickers (Colaptes cafer and C. auratus), two inter-breeding Wood- peckers also well distinguished by hues and patterns, and Anglo-Indians that of the Indian and Burmese Rollers or “ Blue-jays’’ (Coractas indica and C. affinis), the latter much darker than the former, and devoid of its conspicuous terminal tail-bar, yet producing numerous intergrades, while the pure forms, as in the case of the Crows, have actually been seen paired up together. Many similar cases might be cited; in fact, just where “‘ recognition-marks” might be expected to be of service, there they uniformly prove inoperative to segregate species—as might indeed have been expected when we see our variable domestic birds infallibly recognize their own species in spite of abnormalities in colour. . Neither does the study of the courtship of birds exhibiting colour-variations encourage the idea of preference for a particular type of colour. Sir Ralph Heron recorded, nearly a century ago, how all his Peahens fell in love with a pied Peacock, and DISFIGUREMENT NO BAR zat Mr. D. Dewar has observed that white Peacocks in the Lahore Zoo had superior charms to the coloured birds; while I have seen London park Mallard Ducks not only pair with all-white, grey- breasted, and rufous-flanked drakes in preference to the typical male in its full beauty of colouring, but in one case recently even with a Spotted-bill Drake (Anas paeccilorhyncha), which has no distinctive male plumage at all. M. Rogeron also says that this Indian species, the African Yellow-bill (4. undulata) and Australian Wild Duck (4. superciliosa), none of which have any distinct sex-coloration, never- theless interbreed with Mallard as if all were of one species. | Recently I saw at Kew a Mandarin Drake whose left eye had been destroyed, and whose face on that side was abnormally white, paired with a fine unpinioned female, in spite of the presence of perfect drakes, one at least unpinioned, which I saw her charge with tail wagging defiantly, instead of inciting her mate to do it, as is commonly done by this most affectionate and selective species. Another bird at the Zoo with misplaced wing, spoil- ing his colour-scheme entirely, also has had a mate for years, though Mandarin Ducks, like Mallard, will tolerate bigamy rather than take to a drake they dislike. I have, however, seen a case in the Calcutta Zoo in which a Mandarin Drake of superior plumage was preferred by the ducks to others, though these were not positively defective; and I have found also in Calcutta a Linnet hen prefer a lame male with a 16 242 BIRD BEHAVIOUR richer-coloured breast to a poorer-hued but per- fect bird, and a hen Avadavat (Estrelda amandava) prefer in two cases a bright to a duller-coloured male. If birds have the esthetic sense with which Darwin credited them, they may, like us, think more of small differences than large ones; golden hair is generally admired by man, but no good judge would put it, as a point of beauty, above well-chiselled features, though it catches the eye more at first. As against the possibility of birds generally being colour-blind, we may perhaps set the preference of the Australian Satin Bower-bird (Pulonorbynchus holosericeus) for blue when choosing decorations for its bower, and the liking of some Weaver-birds for green and yellow wool when given this substance to amuse themselves with in a cage. It will be noted that yellow is a common colour among Weavers, and that the eyes of the above- mentioned Bower-bird are blue, a very rare colour in live birds’ eyes, though taxidermists are fond of it in glass ones ! : Before leaving the subject of the sense of sight in birds, attention must be drawn to its extra- ordinary acuteness in Humming-birds, which, as I have been able to observe in the case of captive birds, appear to be able to see glass; at any rate © they do not fly against it as other birds constantly do. — The sense of smell in birds seems to be little — developed as a rule, not more than in ourselves, at § all events judging Ee their behaviour. : “DEVELOPMENT OF SCENT 243 The Apteryxes, however, are exceptions, as these birds, which unlike all others have the nostrils at the tip of the beak, nose their way about like a beast, even sniffing audibly. Some sportsmen also are of opinion that wildfowl have a keen scent, and should be approached accordingly with due regard to the direction of the wind, as in stalking deer and other similar animals; and decoymen used to burn a turf before their mouths when working a decoy, so as to hide the human scent. St. John also recorded that his domesticated wild Ducks scented out a heap of diseased potatoes which had been well covered with earth. On the other hand, Mr. Millais found that wild Geese approached quite near him when concealed in a pit, so as to suggest they had no particular power of scent. The sense may be well developed in the Crows, for M. Rogeron says a pet Jackdaw of his could distinguish between salt and powdered sugar, which nevertheless were alike to the eye, taking only a few grains of the one substance and a big beakful of the other, and Dickens describes how his second tame Raven disinterred the halfpence and bits of cheese his predecessor had buried in the garden. Pigeons also used at any rate to be credited by fanciers with liking the smell of aniseed, which was supposed to attach them to a cote. The only case in which I myself have seen any- thing which suggested scenting power in a bird was that of a Pied Hornbill (4nthracoceros mala- baricus) I kept in India, which, when offered tr - en en 244 BIRD BEHAVIOUR butterflies, refused the Danaids after pinching them with the tip of the bill, and treated a cigar-end in the same way. The latter substance might have been rejected by touch, but in the case of the insects, as the bird ate other butterflies, it seems only natural to conclude that it detected an objectionable scent by means of the posterior nares; taste was out of the question, as the tongue in the Hornbills is so very short, and the beak, for some inches from the tip, as dry and horny inside as out. With regard to the very birds in which one would expect scenting powers to be particularly well developed, the Vultures, all the evidence is against this, those who have experience unanimously declaring that a carcase if well covered over is not detected by them; and in Darwin’s classical experi- ment with a hungry Condor the bird did not appreciate the nature of the contents of a paper parcel of fresh meat till he touched it with his beak, in which close proximity the odour of raw flesh would no doubt be detected by a human nose. In spite of the less elaborate structure of the internal ear, and of the absence cf an external one altogether, there is no doubt that the hearing of birds is at least as good as our own, and in many cases possibly even better. ‘This is particularly remarkable, because not only is the outer ear or auricle wanting, but the ear-hole itself is generally overhung by a dense patch of short and very firmly rooted feathers, the ear-coverts, which sometimes remain when the rest of the head is naked, as in the GEESE AS NIGHT-WATCHMEN 245 Sarus and Australian Cranes (Antigone collarts and A. australasiana). In most bald birds, however, the ear-hole is exposed, as in the Ostrich and Turkey, and so it is, curiously enough, in an Australian bird with otherwise feathered head, _ the Mallee-hen (Leipoa ocellata). The perfection of birds’ hearing may be accur- ately judged of by the performances of the various talking and mimicking birds, such as Parrots and Mynahs, whose imitation of their models is often absolutely perfect ; and the susceptibility to sound of species which have not these vocal gifts is well known. It is said that the wild Turkey, when being lured within shot by an imitation of the hen’s call, will at once detect a false note, and be shy for the rest of the season; and the Canadian Goose dis- tinguishes at once, according to Audubon, between man-made sounds and the natural ones of the woods and wilds, the crack of a dry stick under a deer’s hoof being discriminated from its breakage by a human foot, and the accidental slap of a paddle against a canoe-side from the flop of a Turtle taking to the water. Every one also is familiar with the Roman Geese whose vigilance is said to have saved the Capitol ; and whatever the historical value of the human part of that portion of Romat history, no goose- breeder, says Fowler, as quoted in Wright’s “‘ Book of Poultry,” would at all doubt it, his own experi- ence corroborating it in every essential point. The Roman poet’s attribution of greater sagacity to 246 BIRD BEHAVIOUR Geese than to Dogs is also borne out by a corre- spondent of Hewitt’s quoted in the same work, who characterized Spanish (Chinese) Geese and Guinea-Fowls, kept in a lonely place, as the best watch-dogs in the neighbourhood, the actual dogs themselves generally only giving the second warning, so that it was thought they themselves relied on the birds. The Peacock is also not inferior to the Guinea-Fowl in wariness at night, and probably also relies on hearing; a few Pea-fowl in game- coverts might prove an excellent and inexpensive guard against poachers. It has recently been noted in the press, too, that Parrots kept in fortresses and on the Eiffel Tower during the war gave warning of approaching aeroplanes when they could not possibly have seen them, and two writers, one who kept a Sulphur- crested Cockatoo and the other a Ring-necked Parrakeet, have recorded, the former in ‘* Notes on Cage-birds”? and the latter in the Avicultural Magazine, that the birds became aware of their masters’ arrival at home at a distance at which any hearing seemed Lan peREo Even the Kiwi will jump if one claps one’s hands suddenly close to it at night, though the waving of a white handkerchief 4 fails to impress its dull sight. | The sense of hearing is much more important — in determining the relations of birds to each other than is generally supposed, and appears to be more important than sight. Thus, the freely — interbreeding species which have been above © RECOGNITION OF RELATIVES 247 commented on resemble each other in voice, even when this differs greatly in the two sexes, as in the Ducks of the genus Anas mentioned, and birds at once recognize and respond to a sufficiently accurate reproduction of their call, as all field-naturalists are well aware. Thus, I have made both a wild jungle-cock and tame roosters answer me, though I am unable to imitate more delicate notes, and have made wild Duck circle round and lower their flight by quacking to them. People who do not want vicious cocks, by the way, should: carefully refrain from mocking their birds thus, as when the fowl’s brain has grasped the location of the chal- lenge in the human, he will attack, and remain permanently spiteful, in which case he is dangerous to small children. Different species—too far apart to readily inter- breed—will associate if the note is similar, as in the case of the Whistling Tree-Ducks (Dendrocycna), when specimens find themselves isolated in cap- tivity, different though they may be in colour. But allied species have a wonderful knack of know- ing each other by sight, even if colour and voice . are both different ; thus, the Mandarin and Caro- lina drakes not only occasionally make love to each other’s females, which is not surprising, as these are so much alike that. one generally has to look at them twice to see which is which, but the females will reciprocate, although the two male birds are very distinct both in coloration, decorative plumage, and voice. 248 BIRD BEHAVIOUR | I was much amused on a most miserable Sunday one January to see a very agitated Mandarin Duck which had got left out in the pairing which was going on despite the cold rain, establishing an understanding with an equally forlorn Carolina drake, in spite of differences of language. Her gestures made it clear to him that she wanted him to drive off Mandarin drakes who happened to pass, and I saw him get two duckings from these while I watched, although she was quite ready her- self to follow any mated Mandarin till he turned to drive her off. The note of the male of her species certainly seems to have a very potent effect on the hen at times ; twice I have seen the common Starling fly to her mate when singing, and pairing take place, the only occasions on which I have observed this, and possibly the “instrumental music” practised by some birds may have charms to soothe the feminine breast. On the only occasion on which I ever saw the pairing of the Green Peafowl (Pavo muticus), the hen signified her assent just after he had rustled his train for the second time, although on the first rustling, after she had apparently been admiring his display with unusual attention, she slipped round behind him, only to ~ come forward again. At such times both this and the common Peafowl utter a long-drawn and peculiarly shrill scream, quite unlike their usual call, and this may have its effect on the hen. I have also seen the common VANDALISM IN SONG-BIRDS — 249 Collared Dove stoop to her mate when he was cooing, and the House-Mynah in India similarly respond to-the chattering song and bowing move- ments of the male, though I have also seen her turn on him for displaying, like the hen Sparrow. In spite of their powers of hearing being similar in character to our own, and their voices often pleasing us, birds have no taste in music, as we understand it, though we must also remember that savage Or primitive music does not appeal to us, nor do we as adults enjoy the horrible noises, such as slate-pencils “‘ scrooped ”’ on slates, which seem to please children. ) But it is at least curious that birds are so wilfully perverse, as we should call it, in their selection of sounds to respond to and imitate; a Canary can be got to sing in answer to the working of a sewing- machine or the fizzling of a frying-pan, and will often spoil its song by the interpolation of a Spar- row’s chatter; while the various mocking species of birds, such as the true Mocking-bird of North America (Mimus polyglottus) and the Shama of India (Cittocincla macrura) persistently degrade their beautiful songs by imitating harsh cries. I have also heard the Indian Orange-headed Ground- Thrush (Geocichla citrina), a species which combines the excellences of the Song-Thrush and Blackbird, irritatingly repeat a most trivial and monotonous note it had picked up in the Zoo aviaries. Some birds seem to be able to hear notes in- audible to us; thus, the Starling when singing 250 BIRD BEHAVIOUR frequently opens and shuts its bill without pro- ducing a sound that I can hear, at any rate, but no doubt the hen hears it; and some of the little Eastern Weaver-Finches known as Nuns or Manni- pais: (Munia), go through all the gestures of singing while emitting scarcely any noise audible to us but a faint mew at the finish. As the hens listen very attentively, they no doubt can hear, and evidently like the music, such as it is, though even to them it cannot sound very loud, judging from their close attention. The sense of touch in birds is certainly not facilitated by their structure—generally horny beaks and scale-cased feet, and feather-covered body ; but it is reasonably acute nevertheless. In Ducks, in which the beak is covered, except at the tip and edges, with skin instead of horn, it is no doubt more acute than in most, and the common Sheldrake has the expanded edges of the beak near the tip so soft that it can fairly be said to have lips, while in the Australian Pink-eyed Duck (Malacorhynchus membranaceus) these lips are quite large and hang down like the flews of a hound, so that the beak should have much tactile sensi- bility. In Snipe and Woodcock, also, the bill is quite soft at the tip, and these birds, like Ducks, feed by feeling in mud; but hard-billed waders like Storks also grope in mud with much success, and many _ of these birds also feel in the mud with their feet, though this, like the scratching action often per- ~ THE PROBLEM OF WHISKERS 251 formed by Ducks in the water, has no doubt for its primary object the loosening of the bottom to stir up lurking prey. The cere, or soft skin at the base of the beak in Parrots, birds of prey, and Pigeons, may have some tactile value, preventing these birds from plunging the beak over the nostrils in the soft food, flesh or fruit, on which so many of these birds subsist ; at any rate, the only other groups in which the beak has a soft covering are the Ducks and Flamin- goes, in which only the end and edges, as has been said, are horny, and these are habitually mud- - feeders, and seek food by feeling. The soft flanges or lips, at the base of the bill in the nestlings of Passerines, Hoopoes, and Woodpeckers, are also sensitive to touch, and no doubt aid the young “‘vellow-beak” to perceive the food the parents offer it; but they are not found in other young birds even of the helpless kinds, and never in active chicks. Whiskers like those of many mammals are found round the face and base of the bill in the Apteryx or Kiwi, so beast-like in its behaviour, and pre- sumably they may serve as feeling-organs in the same way; but it is less easy to divine the use of the bristles found at the sides of the beak, and often where it joins the forehead, in many birds which feed on flying insects, and specially conspicu- ous in the Nightjars and Flycatchers. They may act as guides for the snap of the beak, but they are absent in many birds of somewhat similar habits ’ pl Gee _ eS 252 BIRD BEHAVIOUR to those which possess them; for instance, the Nightjars of the genus Chordeiles have none, nor do the Swallows or Swallow-Shrikes exhibit them. Yet they are particularly well developed in the Barbets of the genus Xantholema, of which the Coppersmith (X. hematocephala) is a conspicuous example well known to Anglo-Indians, and these are chiefly fruitarians, while the more omnivorous Barbets of South America have bristleless mouths. The feet of birds seem fairly sensitive to pain— at any rate they nurse a hurt foot by holding it up; but generally speaking they are, like the lower animals generally, very indifferent to injury. Ducks, for instance, after being pinioned and released into the water, do not look at the mutilated member, but throw water over themselves as usual after being handled, and may even begin feeding*~in the case of ‘T'ree-Ducks, which are far less nervous than Ducks generally. I do not, however, think this justifies the opera- tion, as I consider mutilating a bird for life to save the trouble and supervision required to'clip its wing annually is slovenly management, and no person who will not take trouble over them is justified in keeping birds at all, especially as the birds which are kept under restraint by pinioning them are > exactly those which are not maintained for practical purposes ; the operation would be pardonable if needed to be applied to poultry, for instance. With regard to the taste-perceptions of birds, there are some puzzling problems. They often GUSTATORY SENSIBILITY 253 are able to determine the taste of an insect, for instance, by taking it up in the tip of their beak, but sometimes, as in the case of the Starling above quoted, do not seem to know whether they will like such an object or not till they have actually swallowed it; in this case the sensation, satis- factory or otherwise, must be determined by the stomach. I have seena toad swallowed and rejected by two large Gulls in succession, and then tried by a third, which after retaining it a while, threw it up and looked at it, but swallowed it again on seeing another coming to investigate, and retained it as long as I watched. Here the process of killing and swallowing by the first experimenters had evidently eliminated most of the toad’s poisonous skin-secretion, but left a dis- tinct power of causing disturbance of a kind; and after all we ourselves do not know in the case of many articles of food if they will “agree with us” till after eating. Birds after tasting something they dislike will often vigorously wipe their beaks, and this is a good sign to follow, if it be borne in mind that wiping the beak may occur under other cir- cumstances. In the case of dry grain, etc., which is swallowed whole, as by Pigeons and Game-birds, all pleasurable sensation must of course be stomachic, and this must be great to induce birds to swallow with pleasure such substances as acorns, and monkey- nuts in the husk, so beloved by Wood-Pigeons. The birds in this case seem to come at an idea of 254 BIRD BEHAVIOUR the edibility of an object by weighing it in their beaks, and are often slow in taking to a new food, as when beans are given to Pigeons, and white peas to Fowls. Generally speaking, the tastes of birds are not so very unlike our own, having regard to the immense variety of human tastes; the Peregrine Falcon, for instance, though it will eat Rooks and Gulls, much prefers Ducks, Grouse, and Pigeons ; and I found the whitebeam berries which the birds so much appreciated had a mealy, satisfying taste, like mashed potatoes—the sort of thing one does not get tired of. Yet on the other hand, birds eagerly eat the sour, bitter berries of the mountain- ash, though even these are made by some people into jelly. Both wild and captive birds readily take to many of the standard articles of human food, even though not suffering actual hunger, as every one may see in the fondness for bread they so often exhibit ; sugar, too, is often greatly relished; I have seen Sparrows eat it in the powdered state in my rooms in Calcutta, and carry it off by the lump at the Crystal Palace. A more curious taste is that for milk, which appeals to a great variety of birds, and makes one wonder if the Nightjar’s classical reputation as a goat-sucker, and the Zulu rendering of its cry “* Milk for your people,”’ is such a fable after all, its mouth certainly being big enough to perform the feat | CHAPTER Ix The emotions of birds—Mentality higher than is supposed, but variable according to species or groups—Strong- and weak- minded birds—Intelligence and stupidity—The limitations of instinct—Expression of the emotions and its relation to courting displays—Love and sociability—Hatred and re- venge—The police instinct—Monogamy, polygamy, and polyandry—The problem of preferential mating. Tue facts detailed in the last chapter seem to indicate that most birds have much the same sense-facilities for acquiring a knowledge of the outside world that we ourselves possess, and so it is not surprising that they are, as far as we can make out at present, as much like us in mind and emotions as we can expect any of the lower animals to be. One might in fact expect them in some respects to be more human-minded than many mammals, owing to their erect position in all cases, frequent habit of perching, and general power of flight—all tending to give them a wider outlook than quadrupeds—in addition to the habit of getting information from sight and hearing as we do, and not, like most of the lower mammals, thinking through their noses and thus getting an entirely different set of impressions to guide their conduct. 255 256 BIRD BEHAVIOUR These similarities to us seem quite sufficient to outweigh what ought to be the handicap of a non- convoluted brain; and in any case, too much stress may be laid on these anatomical characters. Rodents have non-convoluted brains, but no one would accuse a rat of want of intelligence on that account, and similarly among birds there are plenty of species in many different groups that can compare in intellectual power with almost any of the mammals other than man, They all of course stop short of human ability just where the higher beasts do—when the power of speech is needed to communicate impressions. In observing the habits of the young chimpanzees which our most enterprising dealer, Mr. J. D. Hamlyn, imports and hands over to his talented wife to receive the rudiments of a human education, I have been impressed with the fact that these apes are quite as human as children, at least till the age at which a child should acquire speech ; but in one which was kept in the Hamlyn establishment for two years it seemed to me that there was no ten- dency to further progress, as there would have been in a child, and this one instance strikes me as more valuable than many observations on apes made to lead the dull monotonous life to which they are condemned in public collections. In estimating the intelligence of birds, we are apt to be deceived by not understanding their expressions of feeling, which are, except in the case of Owls, which have faces of a recognizably similar _..: . sasBeou#oueeeeeeeeee OBSERVANT WOOD-PIGEONS 257 type to our own, not at first easy to interpret. Thus, it is difficult to see in many cases if a bird is observing anything or not; every one must have wondered at the apparent unobservance of common Pigeons when a cat is stalking them, until their flight at the right moment shows that they had properly estimated the danger and were els to it all the time. Woodpigeons, too, with an expression of stu- pidity hardly equalled by any other creature, have yet ‘sized up” the habits of man in a most scien- tific way ; petted as they are in London, they will fly away from a single individual walking through a park in which they will settle on the hands of a person where others are about, showing that they have grasped the fact that men when in company do not assault Pigeons, though a single individual may be dangerous by owning a gun, for instance. The apparently unseeing stare of so many birds is no doubt the reason why they may often falsely appear to us to be indifferent to the display of the other sex, though there 1s also plenty of proof that the said display may really leave them unmoved or even cause anger; thus, I have often seen the hen Sparrow and in one case even the hen of the beautiful Orange Bishop Finch (Pyromelana fran- ciscana). turn savagely on the male as he was showing off before her. Similarly, one very likely under- rates the scenting powers of birds because they do not sniff, having rigid-edged nostrils, but they no doubt often detect odours nevertheless. 17 268 BIRD BEHAVIOUR We must always remember that the mind of birds is more like that of a young child or of a savage than of an adult of a civilized race of men, and this will help us to understand their actions in many difficult cases. The apparent indifference of birds to courting displays, for instance, may be very like the behaviour of small children to a stranger who takes notice of them; children are often in such a case apparently quite unconcerned, but their friendliness on the next occasion, or what one is told by their parents, will generally show that they appreciated advances which they seemed to ignore at the time—a fact I have often been witness of, as I have the honour to be among those in whom children instinctively place con- fidence. . When a bird happens to have the same mode of expression as a mammal, the resemblance in its actions is often startlingly close; thus, for instance, it is well known that beasts have a habit—which ‘appears generally considered extremely touching, but is to me peculiarly nasty—of licking their friends. Birds do not generally do this, not be- cause they are cold-natured, but because it is not generally their custom to lick anybody or anything ; but, to my great interest, a specimen of the Black Lory (Chalcopsittacus ater), the tamest of Parrots and one of a honey-licking group, licked my hand as soon as [ put it near the cage on our first intro- duction at Mr. Ezra’s London flat; and a chained © specimen whose acquaintance I made years before © ANSERINE INTELLIGENCE 259 in Calcutta dropped from its swing on to my hand, and there lay on its back, and tried, monkey-like, to cling to me when I was leaving it. Others who have had experience with Parrots will be able to recall similar mammalian-like actions; and they, together with Hornbills, Guans, and Emus, are certainly as fond of being petted as any cat or dog. Geese may display very human attributes; I have seen in India a Chinese gander (the usual domestic species there) sitting beside his favourite goose which was incubating, with his neck laid across her back, a position precisely analogous to the embracing arm of a loving man or ape; and from the time of the philosopher Lacydes onwards, instances have been recorded of common Geese taking a fancy to individuals and following them about with the fidelity traditionally associated with dogs; traditionally but nct scientifically, because if dogs were universally or even usually faithful they could not be sold or otherwise change owners. The most remarkable case of this that has come to my knowledge is recorded by J. T. Smith, who says in his ‘“* Book for a Rainy Day ” that his mother found when at Greenwich in 1766 a Goose which used to go the rounds with an old woman who sold pies and cheesecakes, and cackled at each customer’: door, going off to the next house if the words “Not to-day ”’ were uttered, and so on till the day’s business was done. In spite of their stupid appearance, Geese are well known to be so intelligent that such occur- a ee Ca ’ Gann BIRD BEHAVIOUR rences are not surprising; Crows, on the other hand, both look and are intelligent, as every one knows, and I had not been long in India before | saw played a trick which was often repeated before my eyes afterwards; the House-Crows would settle near a Kite which had alighted on a building with a piece of food too heavy to devour on the wing, one taking up a position in front and one behind it, and the game was then for the Crow in front to badger the Kite until a favourable opportunity occurred for the confederate in the rear to jerk its tail, when of course the booty was snatched by the front bird as the infuriated Hawk turned round. | As the Crows would pull a Kite’s tail at any time | when the Kite was pre-occupied, as when drinking or picking up a stick for its nest, it is easy to see how the idea suggested itself, but the working out of the plan showed intelligence, and the co-opera- tion was explained by what I ultimately observed, that the Crow which took the post of danger in front allowed the other to take best part of the spoil, thus showing that in all probability a pair worked together, the easiest part of the plan, the tail-pulling, being left to the share of the weaker sex. I have heard and read of the same tactics being used with dogs, but never saw this. With a young Kite in its first plumage I have even seen a Crow dash in and boldly snatch the food from it direct. Only on one occasion did I : see the wily Crows “bested” by a Kite. This © : bird, no doubt taught by painful experience, had — ane INTELLECT OF PARROTS. 261 alighted in a strategic position on the corner of a flat roof where it could not be assailed from behind ; and when two Crows appeared, evidently anxious to obtain its booty, the entrails of a fowl, which trailed across the roof for a foot or so away from it, the Kite gathered up this loose portion under its feet, and went on with its meal in a most uncon- cerned way, while the disappointed Crows sheered _ off in search of something easier to steal. Although one must not attach undue importance to their power of imitating our speech, there can be no doubt, I think, that Parrots are highly intelli- gent birds; in fact, I can never understand why they are not still placed, as they were by some naturalists, such as Edward Blyth, quite the greatest of ornithologists, at the head of the bird class, since they present so many analogies with the monkeys amongst mammals. Even the little Bud- gerigar, with its Finch-like habits, is a far more in- telligent bird than any ordinary Finch, for, once its nervousness is overcome, it readily learns tricks, much more so, I am told by Mr. J. Harris, who makes a speciality of training these birds, than the Greenfinch, a bird of about the same size, and not stupid as Finches go. Most people would probably say the common grey African Parrot is the most intelligent of birds, and, though its natural shyness results in its intelli- gence being known generally only to its immediate acquaintance, I have twice known it do remarkably human things. In one case a bird boarded out 262 BIRD BEHAVIOUR at a dealer’s shop, a good talker in two languages I was told, had become independent of the usual head-scratching by human fingers, for it would scratch its head itself with the swing in its cage, grasping this with one foot as it stood on the perch below, and moving it backwards and forwards over its poll. The other bird I was told of when delivering a course of lectures at Maidenhead some years ago; this would scratch its head with a piece of stick, according to the account given me, and though with the usual perversity of the species it refused to perform in my presence, it did at any rate condescend to take the stick proffered by its owner in its foot and hold it a while. From my own experience I think I should ‘rate the great Salmon-crested Cockatoo of the Moluccas (Cacatua moluccensis) as the most intelligent of birds ; this will even make use of signs to intimate its wishes, for when one approaches a Cockatoo of this kind—they are always tame, being presumably hand-reared—it will commence stroking its head with its foot in an obvious invitation to “‘ scratch a poll’? which is quite sincere, for I have never known one abuse the confidence reposed in its tame- ness. The only other Parrot I have seen make this sign, and that more rarely, is the large Red-and-Blue Macaw (Ara chloroptera), and this also is the only | bird I have seen smiling ; when so doing it extends | the upper bill straight forwards and draws back © r SIZE AND) CHARACTER || 263 the corners of the mouth, producing a weirdly ugly expression which might easily be mistaken for yawning, but is assumed under quite appropriate circumstances for a smile, as when the bird is being petted and played with by some one whom it knows and likes. | Generally speaking, in birds of the same group the larger species will be found more intelligent and of more marked character than the smaller, though there are numerous exceptions to this; for instance, an aviary of Parrakeets can be kept up with much more safety than a collection of Cockatoos and Macaws, and in a pond stocked with waterfowl it will be found that all species larger than the common Wild Duck are not only more tameable and intelligent than that bird, but much more jealous and vindictive, and apt to pursue their quarrels to the death, while the squabblings of the smaller species seldom lead to anything serious. Pronounced vigour of character is, however, also a prerogative of certain special types; thus among Parrots the Conures, though not large, are birds.of much character, and among Ducks the Sheldrakes, though considerably smaller than the Geese. Among small birds, too, I have found the Pekin Robin (Liothrix luteus) a remarkably intelli- gent species, with plenty of presence of mind; if turned out in a garden it will soon find its way back to its companions in captivity, if there be any of its own species, and displays no fear of the mob- bing of the Sparrows, which, to do them justice, are 264 BIRD BEHAVIOUR in such cases, according to my experience, actu- ated more by curiosity than by malice, as I never saw any of the Pekins I turned out in London parks hurt by them, even if they happened to be in poor condition. I even saw one of these birds rob a London Sparrow very cleverly ; the Sparrow had carried a bit of bread under the bush in which Lzothrix was perched, when the Chinese bird jabbered at him, giving his alarm-note, and the Sparrow fled in terror, leaving the bread to be appropriated by his rival. Another bird of this kind, placed in an aviary in Calcutta, detected and seized a small cockroach which lived in a crevice and had baffled the other inmates before he had been in the place five minutes; and on a perch having fallen down with a great clatter on being shifted, was down on the next one investigating the cause of the disturbance before the flutter caused thereby . among the other inmates of the aviary had sub- sided. Should any one be anxious to investigate system- atically the workings of a bird’s mind, I should strongly recommend this knowing little species, which being largely insectivorous has more chance of showing versatile intelligence than a seed-eater, — though some of these are very intelligent, not only among Parrots, but among Passerines, such as © the Redpoll, Sparrow, and Baya Weaver. There are undoubtedly many birds and groups of birds whose intelligence is extremely low com- AN UNJUST ASPERSION 265 pared with those I have dealt with; such birds as Bustards, Tinamous, Sand-Grouse, and Pigeons, for instance, though often wary, are not what one would call bright and clever. It will not do, however, to try to estimate a bird’s intelligence from its morphological status; for instance, Grebes are supposed to be a “low” type, but my experience of them is that they are very intelligent, far more so than any other waterfowl, at any rate in the case of the Indian Dabchick, a bird which minutely examines everything, and as I proved, knows one person from another, even though not fed by any one. Parker, from anatomical considerations appar- ently, saw fit to stigmatize the Rails as a “ feeble- minded, cowardly group,” which they most em- phatically are not, when one comes to know them intimately. ‘The common Moorhen (Gallinula chloropus) is, 1 should say, an infinitely more coura- geous, intelligent, and generally strong-minded bird than the wild Duck, though that is a good steady-nerved sensible bird as Ducks go. Their be- haviour in London well illustrates this, for whereas both birds are kindly treated there, and have been for many years, the Duck can never overcome the timid instinct of hiding its nest, and rarely breeds on small ponds; the Moorhen will often nest in the full view of the public, and at the time of writing a pair had bred for years on a tiny island in a little stone-faced pond in the middle of Goldhawk Road in London, within a few yards of an electric 266 BIRD BEHAVIOUR tramway, a big public-house, and a picture palace! The Moorhen, evidently, would say with Diomed: “*'Thou dost miscall retire, I do not fly; but advantageous care Withdrew me from the odds of multitude.” In birds of the same group and closely allied the same difference can be seen; the Wood- — Pigeon, domiciled in London for only a few decades, has shown itself much more ready to take advan- tage of human friendship than the House-Pigeon, which has been a public pet there for probably as many centuries. ‘The woodlander is now nesting in absurdly low trees, even in those surrounding Trafalgar Square, and even more readily alights on people’s hands to be fed than the other bird does. Among the Ducks the same thing can be seen; I have only once seen the Carolina Duck dive for food, when a female thus caught a fish at Kew, yet its ally the Mandarin, though less specialized as a swimmer, dives quite frequently for food, and unlike other surface-feeders, goes under with its food when worried by Gulls. Observers of Humming-birds sometimes comment on the very insect-like behaviour of these tiny birds, but in this I fancy they have been misled by the minute size and insect-like flight, for as far as my observations, which I must admit have been limited to a few captive individuals, have gone, I cannot see that they show less intelligence than MORE BRAINS THAN PLUCK — 267 other very small birds, small species being, generally speaking, more childish in their ways than large ones; in fact, the readiness with which Humming- birds adapt themselves to captivity is rather a proof of high intelligence than otherwise, since such adaptability is often found in birds whose intelligence is known to be high, like wild Geese, which are much more easily tamed than Ducks. Here, however, temperament may come in; the Ducks are intensely nervous as a rule, a remarkable exception being found in the generalized Tree- Ducks, which come in some ways nearer the Geese, and are certainly like them in disposition. A nervous bird, too, may nevertheless have plenty of character and intelligence ; the Pekin Robin, a very intelligent bird, as I have said, is frantic in a small cage, bold and inquisitive in a large one, while the intelligent Sparrow submits to captivity with a very bad grace, bearing it worse than many less intelligent species. Like all the lower animals, birds have distinct limitations of instinct, even intelligent species constantly failing in adaptation—else they would be human; in the introductory chapter I have spoken of the failure of the Sparrow to acquire the knack of manipulating its food with its feet, and the same may be said of the Starling, also an intelligent and versatile bird; while the intelligent Parrots, except in the case of one species, never think of making nests, so common an instinct with less gifted birds, a peculiarity which no doubt accounts 268 BIRD BEHAVIOUR for the fact that the comparatively very stupid Pigeons, with much the same general distribution and diet, have nevertheless on the whole a wider range and greater success in the struggle for exist- ence, since they can at any rate construct their own cradles, and do not usually depend on holes, found or dug out, for a breeding-place, as Parrots do. The association between general intelligence and | strength of character and the hole-breeding habit 1s often very marked, occurring in Parrots, Starlings, Tits, and Sheldrakes, for instance, but as it limits the breeding potentialities of birds, it must be regarded as either degeneracy or a blind retention of ancestral custom, as compared with the nest-constructing instinct, and is no doubt favoured by the fitness in other directions of the birds which practise it. It is probably the great and general development of the nest-constructing instinct in the Passerines which accounts largely for the success of these birds, since in general intelligence and strength of constitution they do not seem superior to many other groups. A very large field of observation is presented by the phenomena of expression of emotion in birds, and it is intimately related to the study of bird courtship ; for it is a very important point to notice that the so-called courting pose is often exactly that which is assumed under any emotions such as anger and even fear, and that it is frequently displayed by the hen equally with the cock. Thus, to take a well-known instance, the Turkey- BLUFF BEFORE FIGHTING 269 cock displays when about to fight just as when showing off to the hen, and she herself may display if the cock is slow in making advances, or if she meditates an attack. The Ruff displays his frill to his rival as well as to the reeve, and even the Peacock has been seen to drive a sitting Swan off her nest by charging down upon her in the display attitude, while I have myself seen a Pea-chick no larger than a Partridge suddenly display its little tail when alarmed by a cat passing close by it. The Muscovy Duck displays when about to pair, when meditating warfare or on alarm—on any excite- ment, in fact, and the duck is nearly as ready to show off as the drake. The Swan and Mandarin Duck display magni- ficently for the purpose of bluff, but when about to pair their movements are quite different and less imposing, the Swan in particular flattening down its wings, expanding the feathers on the head and upper neck, and repeatedly plunging head and neck under water; while among the Tree-Ducks there is frequently a marked display after, but not before, pairing, both partners executing a step- dance in the water with one wing held aloft. Generally speaking, the gestures of males and females in display are the same, but there are some exceptions; thus, among the typical Ducks—the Mallard and its allies—the duck and drake use quite different actions, though there is a marked exception in the case of the beautiful Falcated or Bronze-capped Duck (Eumnetta falcata), in which 270 BIRD BEHAVIOUR the very soberly coloured females show off simul- _ taneously with, and with the same gestures as, the highly decorated drakes, which is more than Man- darin Ducks usually do, though they exhibit drake- displays occasionally. In a case I noted one winter when a pair of Blackbirds were disputing over food, I observed both cock and hen running around with trailing spread tails, as cock Blackbirds do when courting. As Darwin has remarked, all individuals of a species display in the same way, and he might have gone further, and said that the display is often a group-character, and common to many allied species; though, on the other hand, one gets sudden differences in this respect between near allies at times, just as one does in the case of notes, eggs, and colouring and decorations. | The Duck tribe furnish good examples of this ; generally speaking, one may say they never display by drooping their wings, though such a show- gesture is acommon one among birds. But display by raising the elbows, and thus erecting the secon- dary quills, is familiar in many species, especially the white and black Swans, though the Black- necked Swan (Cygnus nigricollis) does not practise it; the males of Ducks most nearly allied to the Mallard rear and curtsey just as that bird does, the plain-coloured species (like the Australian Mallard and Yellow-billed Chilian Teal, Nettium flavirosire) doing so just like the sex-decorated forms, an important point, since it shows the display PO no en SHOWING WHITE FEATHERS ~ 271 is older than the decoration; while the Mandarin and Carolina Ducks, nearly allied as they are, seem to have gone out of their way to display differently, the former raising his crest as much as possible, and throwing his head back and breast out like a Fantail Pigeon, while the latter raises his head and tail as if he were being lifted up by an invisible string attached to each end, and posi- tively flattens down his crest as much as possible. This is a particularly interesting case, first because the displays of other twin species with high decoration—the two Peafowl, the common Turkey and the brilliant Honduras Turkey (Melea- gris ocellata), and the Golden and Amherst Pheasants —are almost exactly alike, and secondly because it is very rare for a bird to reduce instead of dis- playing a decorative feature, although a similar case is found in the Bulbuls, which also depress their handsome crests when courting, though they erect them when alert, as does the Carolina drake also. It is very noticeable that whenever a bird has any white about it, this is almost invariably the main feature of the display, no matter what other colours are present ; this is well seen in the court- ship of the Magpie and the Great Bustard, and the peculiar gesture of the Carolina drake is well adapted to show off his white throat, while the crest-expansion of his ally may be connected with the fact that he has much more white in his head- dress. On the other hand, the rear-up of the Bronze-Cap drake conceals his white throat, as he 272 BIRD BEHAVIOUR bends down his head after the fashion of his allies the Gadwall and Teal when executing this gesture. But another very striking display of white is that of the Moorhen, which makes a great show of its white under-tail plumage when angry, defiant, or amorous, and the blue Porphyrio of India (Por- phyrio poliocephalus) does the same thing. ‘This bird also claps its wings over its back when excited, a gesture also found in the Globose Curassow cock, and as every one knows, in our common Chanticleer ; especially does he do this before crowing, but the Grey Jungle-Fowl (Gallus sonnerati) does not, so far as I have seen, and the green Javan Jungle-Fowl (G. varius) claps its wings after crowing, like the Pheasants, which is interesting, as this species is the most Pheasant-like of the Jungle-Fowl. In the Silver Pheasant the crow is suppressed and the wing-flapping becomes a buzz, though to me no sound is audible, but the allied Lineated Kaleege (Genneus lineatus) is credited with making a noise which suggests an earthquake, and the drumming of the courting Ruffed Grouse of America (Bonasa umbellus) is apparently produced by a similar very rapid agitation of the wings. It is in one of the Grouse that courting emotion appears to reach its highest pitch; in the well- known love-song and display of the Capercaillie the performer gets so excited at the highest pitch of the performance that he gnashes and foams, closes his eyes, and becomes deaf by the swelling of the soft palate, while the tree he is perched on ag SENTIMENT IN PEAHENS 273 absolutely trembles ; it is at this point that sports- men on the Continent advance in stalking him, though the admiring hens do their best to give warning. Gnashing or snapping of the beak under excitement occurs, by the way, among various other birds; it is particularly to be noted in Owls when menaced, and in the cock Rhea when anxious about the safety of his brood. The attachment shown by the Capercaillie hens to the cock has parallels elsewhere, notably in the fondness Peahens display for their favoured mate; | Heron states that his birds went unmated one whole season because their favourite was shut up, but in a wired run where he was still in view; yet his rival was a black-winged bird, more beautiful than the type, and the successful bird was pied. I recently, however, saw a Peahen in Regent’s Park associate persistently with a black-winged Peacock instead of a common one; but the former was nevertheless inferior in beauty, as he only bore his first full train, while the other bird was at his best. The older bird, although feared by the younger, did not press his advantage; and it is this propensity to leave matters to the female’s choice that makes Peafowl and Mandarin Ducks so suitable for the study of sexual selection, for birds which fight matters out upset the issue. In Peafowl the male seems to have no sentiment about the hen, but in many birds the male is selective whenever he gets the chance, which seldom happens in the wild state, females being at 18 274 BIRD BEHAVIOUR a premium ; the preferences of Fowls for particular hens are, however, well known, and Chaucer makes a great point of this in his story of Chanticleer and Partlet. I have myself seen a large half-Spanish cock always accompanied by bantam hens, where the attachment must have been mutual, as he was master of the yard and could have had his choice, while he could not have compelled the attendance of such active little creatures had they not actually preferred him to the bantam cocks. A Buff Cochin which was the pride of my boyish poultry-fancying also was much in love with the smallest and prettiest of our mongrel hens, and a Globose Curassow cock at the Zoo was devoted to a hen of the handsome zebra-marked aber- rational type described as Crax hecki, preferring her to three normal brown hens. He bred with her twice, and when separated from her on the second occasion lest his fury in defence should endanger the chick (which, by the way, is a hen, and typical globicera), moped and would not eat for some days. Such grief is not unusual among birds of strong character; Rogeron cites a case in which a Carolina Drake died of nothing else but shock at the death of his mate, and Hume gives two instances justifying the current belief in India that if one of a pair of Sarus Cranes is shot the other will pine to death. Besides love, birds exhibit hatred in a very marked EN their general rancour against Owls is very noticeable, and high-spirited species A DUCK-POND VENDETTA 275 of the same group often display marked. animosity when they meet; for instance, Sheldrakes have a general aversion to Geese, and usually bully them, in spite of their own smaller size. ‘The jealousy of male birds is well known, and of course leads to numerous fights; but male birds will also fight over nesting-sites, as 1 have seen in India with the House-Mynah, the hens looking on as seconds. The mobbing of Hawks and Owls is no doubt often dictated by revenge; and birds may be ob- served sometimes to harbour a grudge. M. Rogeron describes a Brazilian Teal (Nettium brasiliense) which had provoked a rather hot-tempered Mallard Duck and been nearly drowned by her in conse- quence, as never failing afterwards, whenever he could do so safely, to smack her across the face paew mish wing.) Dr. A.) G. Tuten :gives)’'a case in which a Whydah-bird, whose long tail-plumes had been plucked out one by one by a pair of nesting Song-Sparrows, bided its time and killed one of the little thieves; andin the Calcutta Zoo a pair of African ‘T'riangular-spotted Pigeons (Columba guinea), which had been much annoyed by the futile attacks of a male Cockatiel (Calopsittacus nove-hollandi@) which was breeding in the same enclosure, revenged themselves on him by pecking his young, when they left the nest, most severely. This was an unusual procedure on the part of Pigeons, which are not usually aggressive to birds not of their own family. As much may be said of most birds whose intelli- 276 BIRD BEHAVIOUR gence is low; unfortunately the higher in type the mind of the bird, the more apt it is to be indiscriminately vicious, as one may see in Parrots, Crows, Weavers, and Sheldrakes. ‘The Caracara Carrion-Hawk (Polyborus brasiliensis) is also more mischievous than other less intelligent birds of prey; I have even known one in the Calcutta Zoo deliberately take any extra bit of food given him up to the partition-bars separating him from an Imperial Eagle (Aquila impertalis), solely to enjoy that bird’s discomfiture at seeing food he could not himself obtain. Some birds are so churlish that they like as a tule to be alone; such are the “nobler” birds of prey—Falcons and Eagles—and most ‘Thrushes, especially the Robins and Nightingales; it is to be noted that these, the finest singers, are also the most cantankerous, and their most thrilling music is, it 1s to be feared, often only a “‘ hymn of hate”? ; but at the same time, hen birds are undoubtedly impressed by song, and canary-fanciers are con- stantly being troubled by a hen bird “‘ pairing by the voice,” and so upsetting any matrimonial arrangements they themselves have made for her, for no other suitor will be well received in such a case until the favoured troubadour is out of hearing. It is quite a common thing to see affectionate birds express their love for each other by fondling each other’s head with their bills, an attention which human onlookers are apt to mistake for a search for parasites. ‘This is often a group- THE CUSTOM OF CARESSING 277 character, being very noticeable in Pigeons, Parrots, Babblers, and Waxbills, for instance; but it also occurs in other groups sporadically, being practised by Penguins, Tree-Ducks, and Coots among water- fowl, and by the Talking-Mynahs among the Starlings. I have even seen a Muscovy Duck caress her downy ducklings with her bill, this species being the most motherly of all the Ducks, while her ducklings for their part seem to cling to her more than do those of others. The -caressing habit is connected with high sociability in many cases, 7.¢. with a tendency to associate in larger numbers than single pairs, and to combine for mutual defence; thus, the small Indian Tree-Ducks will tackle other waterfowl several together, and Mr. H. Wormald has lately recorded how the White-faced ‘Tree-Ducks (Den- drocycna viduata) recently reared by him resented the handling of one of their number, gathering -round with drooping wings—a very remarkable gesture for Ducks—and flying up as if to effect a rescue of the prisoner. This drooping of the wings under social excite- ment is no doubt the origin of the “ shamming lame ” behaviour common to so many birds when beguiling enemies away from their nests and young, as in the case of the Partridge, Lapwing, and Sheldrake; though no doubt the habit, emotional at first, becomes afterwards an intelligent action, in some cases at all events. Similarly, the “‘shamming dead” action, as exemplified by the 278 BIRD BEHAVIOUR Landrail and Tinamou, is regarded by Mr. Hudson as a kind of swoon induced by extreme terror; but I have noticed that cock Purple Sun-birds (Cinnyris astatica) when attacked by a rival in confinement, hang from the perch by the feet as if dead, which looks rather like a ruse de guerre. Sun-birds, like all honey-eating birds, are very pugnacious, but among these sweet-loving swash- bucklers some, the comparatively large plain-coloured Friar-birds of Australasia (Philedon), are full of social instinct, and unite to drive off Hawks and Crows. Hence has arisen the idea that they are “‘ mim- icked,’”? unconsciously of course, by some Orioles which live in the same islands and resemble them in their sober snufi-brown colours; but as the ordi- nary gorgeous Orioles of Asia and Africa get on all right without mimicry, and as in Australia itself the Orioles, though not very bright, do not in the least resemble the local Friar-birds, the theory is unnecessary. The police instinct which leads high-spirited birds of active flight to attack predatory species is, however, usually developed among solitary rather than social species; the King-bird (Tyrannus carolinensis) of North America is perhaps the most striking exponent of this policy, but he has a worthy rival in the very abundant and conspicuous “* King- Crow,” or common Drongo Shrike of the East, while in Europe the Missel-Thrush takes up police duty. Birds may even assume the function of warning AMERICAN KING-BIRD, The King-bird is dark grey above and white below, with a flame-coloured crest, which, when displayed, is said to attract insects. 278 [By permission of ‘* The Graphic.’” KING-CROW. The King-crow, being very common, and habitually perching in conspicuous places, is one of the best-known birds in the Old-World Tropics. [By permission of ‘The Graphic." ¢ CHANGING THE SENTRIES 279 other species against man, as gunners in this country well know in the case of the Curlew and Redshank, while in India the Ruddy Sheldrake is the best known sentinel. In the case of this bird the motive is certainly not philanthropic, or rather philornithic, for, as may be seen in our parks, it cherishes an extensive prejudice against all other waterfowl, but being naturally wary and excessively noisy to boot, it becomes automatically the watchman for its neighbours. Flocking birds of the more intelligent kinds very commonly have sentinels of their own flock, and in the case of wild Geese the process of changing sentry has been observed; the sentinel may be approached by one of the flock and touched, after which it lowers its head and begins to feed, while the relief bird assumes the watching position—or it may, as has also been seen, force another bird to take its turn by dealing it a hard peck. In some cases, as is Ly known, sociability amongst birds extends to social nesting, familiar to us in the case of Rooks and Sand-Martins, though it is more common among sea-fowl—in which it is usual—than land-birds. The well-known Social Weaver, the Republican Grosbeak of the old naturalists (Phileterus socius), carries the social habit, usual among Weavers, so far as to construct a common roof of grass, under which each pair con- structs its own nest, and a somewhat similar habit has been alluded to above in the case of the only nest-building Parrot. As a general rule, however, 280 BIRD BEHAVIOUR even birds which are social in winter nest in separate pairs, though associations of two males and one female, or vice versa, have been recorded; and polygamy is weil known in many game-birds and in Whydah-birds (Viduine), while polyandry appears to be normal in Hemipodes and Tinamous, and the parasitic nesters like Cuckoos and Cow-birds are credited with promiscuity. Generally, however, the pair are faithful, not only for the season, but, so far as evidence goes, for several years, probably until a stronger rival ousts the older and weaker partner, for strength appears to be the chief determining factor in bird marriage. At the same time, sentiment presum- ably has something to do with it, because one so often sees cross-matings among the various species of Geese kept in our parks ; Geese are very intelli- gent, and not very amorous, and wild hybrids among them are practically unknown, so that it would seem that these irregular alliances are dic- tated by congeniality of disposition where there are but few of each species to choose from. \ CHAPTER X Song and cries of birds—Bird-language generally—Extent to which the notes are instinctively developed—The instinct of mimicry—Species which can imitate human speech—Problem of this ability and extent of exercise of the same—Possibility of understanding of bird-language by man. From the earliest historical times the voices of birds have attracted at least as much attention as their flight and plumage, as is natural, for they are the most vocal of all animals, voice being more charac- teristic of them than flight, for there are a good number of flightless species, as we have seen, while none are destitute of voice at all ages and in both sexes; for even among the typical Storks, which have evolved a sort of deaf-and-dumb language by clattering the bill, the nestlings utter wheezing squeaks, and although some of the males of the Ducks are nearly voiceless, such as the Muscovy drake, which only utters a wheezing sound as if panting for breath, the females always have a distinct loud note, though in the case of the Muscovy Duck this is rarely uttered. The curious bulb found at the base of the wind- pipe in so many of the males of the Duck tribe seems to act as a damper to the quack of the drake ; 281 282 BIRD BEHAVIOUR thus, in the common drake, though he can make a much louder noise than the Muscovy, the quack sounds exactly as if he had an extremely bad cold. Drakes, indeed, can seldom produce so full a sound as the ducks, and the voices of the two sexes are not interchangeable as they are in some other birds—most of my readers must have come across a crowing hen or a singing female Canary, and every one knows the cock can cluck and cackle just as much as the hen. The voice of birds is produced in the syrinx, a special vocal organ situated at the base of the windpipe just at its bifurcation to enter the lungs, and it is here in the drakes that the “ drum” is developed where it exists. Where it is present but very small, as in the Ruddy Sheldrake (Casarca rutila), the drake may have as strong a voice as the duck, and where it is absent, as in the tiny Cotton- Teal (Netiopus coromandelianus) the drake’s note may be stronger, the male in this little Duck cackling loudly, while the female only squeaks like a duckling. In the Tree-ducks there is no bulb, and both sexes have a strong voice, uttering a whistling cackle or a subdued twitter; in fact, they can modify their voices almost like the singing Passerine birds. In the latter the vocal muscles developed at the base of the windpipe are particularly strong, but the same development is found in the Crows, which are not commonly reckoned as songsters, and in one type of Passerine bird supposed to have 4 THE -IMITATIVE FACULTY 283 lower grade of “syrinx,” as this vocal organ 1s called, the Lyre-bird (Menura) of Australia, the voice is very flexible and the bird is a splendid mocker even when wild, and has been known when brought up tame even to imitate human speech. In the groups with the greatest perfection of vocal organs great imitative faculty is common, as we see in the case of the Starling and Jay, both of them well known as talkers when tamed, and given to imitating various sounds—generally cries of other birds—when wild. ‘The Crows and Starlings generally are the chief talkers and mockers, and exercise the latter faculty even in the wild state. Many people must have heard the Starling’s - imitations delivered from a chimney-pot, and the African White-necked Crow (Corvus scapulatus) has been known to amuse himself by imitating a Bustard’s call, to the great discomfiture of the pursuing sportsman. ‘The abilities of our Sedge- Warbler and of the American Mocking-bird (Mimus orpheus) are also well known, and so are those of the New Zealand ‘Tui or Parson-bird (Prosthemadera nove-zealandi@), one of the honey-eaters. In fact, in every country with a reasonably varied bird-population there is sure to be some species with the mocking faculty, exercised apparently purely for the pleasure it gives as arule. Audubon, however, credits the Northern Shrike (Lanius borealis) with beguiling small birds within its reach by imitating the cries of a bird in distress, and Dame Juliana Berners, in the Middle Ages, strongly 284 BIRD BEHAVIOUR denounced our nearly-allied Great Grey Shrike (Lanius excubttor) as an “‘ ungratefull subtill fowle”’ for the same treacherous manceuvre. But it is curious that such imitative birds do not, when wild, generally copy human speech, though I have myself come across a case which seemed very like it; when living a few years ago just north of Regent’s Park, I used to hear a voice in the very early morning outside my bedroom saying “ Pretty Polly,” and at first blamed some one for unfeelingly putting out an unfortunate Parrot to shiver in its cage in a cold spring dawn; but ultimately I found the talker to be a wild Blackbird, which came to sing his matin song—which, as every observer knows, is more varied than his musical perform- ances given later on in the day—from a very tall tree in a garden at the back of my bedroom. Un- less the utterance of these words was a mere “‘fluke,” he had probably picked them up at some time from a Parrot, for the Blackbird is at times imitative, though not nearly so much so as the Starling or Sedge-Warbler, or even the Song-Thrush. If the resemblance to human speech were merely acci- dental, this might explain Pliny’s story of the “‘talking Thrush” in the possession of the Em- press Agrippina in his day, for the Thrush is notorious for the human-like phrasing of its song. I do not know that the well-known and celebrated black talking Hill-Mynahs (Eulabes) of the East exercise any mocking faculty when wild, but if they do not it would be nothing wonderful, con- A MUSICAL PARRAKEET 285 sidering the talking faculties of Parrots, which have a less elaborate vocal apparatus than these Mynahs or other Passerine birds, and seem to have no imitative faculty at all until reclaimed by man; though as a matter of fact, I do not suppose much is known of the intimate habits of Parrots, which, like most birds of particular interest to the ‘‘ man in the street,” are neglected by ornithologists, and are in any case not easy to study when wild, most of them either spending all their lives in the tree-tops, or at any rate retiring to them when not feeding. At least one can sing, however, the familiar little Budgerigar, and this bird, when hand-reared, can be taught to talk—hardly any Parrot, by the way, - will learn anything when adult; but in the case of the present species I have known an unmated cock, kept in an aviary along with a Thrush and other birds, learn the Thrush’s rather complex song quite perfectly, though of course his rendering of it was in a very “ still, small voice.” Several of the other non-passerine groups contain singers, song having been recorded in Hornbills, Kingfishers, and Humming-birds, the singer in the last case being the smallest or almost the smallest of all, the Vervain Humming-bird (Mellisuga minima); in fact, generally speaking, song-birds are small members of their groups, the large Lyre- bird being quite an exception. The Amherst and Cheer Pheasants also undoubtedly sing, if the song is not very musical, and observers of that charming 286 BIRD BEHAVIOUR little diver, the Long-tailed*Duck of our northern coasts (Harelda glacialis), speak of its “* song.” Song, it must be understood, is quite a con- ventional term when used in the ordinary way ; technically it means any noise which is not a call- note; thus the Cock’s crow is just as much a song as the Nightingale’s musical efforts. With short simple songs like the Cock’s crow and the Chaffinch’s short outburst, the development is instinctive; but anything more complicated has generally to be learnt from others of the species, and the result of this is that a hand-reared bird, if uneducated, sometimes turns out a most extraordinary jumble in which no trace of the proper song can be detected. Thus, an old school friend of mine, Mr. C. Bard- well Clarke, brought up a young Linnet, which, reared in a town, developed no Linnet notes at all, © but sang a jumble of the Starlings’ whistles and the chattering of the Sparrows; and conversely, a Sparrow brought up with singing birds will produce a noise we can accept as song, instead of the “ chip, chip, cheer”? which seems to be the natural and spontaneous outpouring of the Sparrow’s soul. The Brambling, by the way, is an example of another Finch which sings disgracefully for a member of a family including such talented creatures as the Linnet and Canary, for the only note in his song is “‘ zee-e,” an expression of emotion which can be bettered even by Pheasants and waterfowl. It is only among Passerines and Parrots, however, that the power of mimicry occurs, and hence only es ee _" j RATIONAL MIMICRY 287 these birds are ever talkers, for only imitative birds have the power of speech, though not by any means all of such species ever develop it, however great may be their opportunities when kept tame. Considering the difference in the vocal organs of birds: and men, this imitation of our speech is certainly not the least wonderful of their pecu- liarities, especially as vocal mimicry under natural conditions cannot be of the least service to them as a rule, but is merely latent altogether, as seems to be the case with Parrots in the wild state, or is only used by way of amusement, with the excep- tion of the Shrike’s alleged treacherous custom. An Indian Shrike which preys on frogs, by the way, has been noticed to incorporate the screams of the hapless batrachians in its song, so that it is quite easy to see how the Great Grey Shrikes of the north might easily begin imitating the cries of distressed birds merely for amusement, and then develop the habit for profit as well as pastime, as described by Audubon and Dame Berners. This would make a close approach to rational speech, and no one who has seen much of intelligent Parrots can doubt that these birds have at least some idea of the meaning of what they say. For instance, I have never heard, or heard of, any Parrot ask for any sort of refreshment unless it saw food, or use any inappropriate word at such times, though it might not know the exact expres- sion. Such a bird, for instance, behaves much like | a person groping a way through a foreign language, 288 BIRD BEHAVIOUR or a child learning to speak. ‘Thus, I have known a Lemon-crested Cockatoo which always said ‘* Cocky wants some breakfast’? or ‘‘ Cocky wants some water’ at meal-times, obviously not knowing the exact words, but at any rate using expressions which had something to do with refreshment. He never said ‘“‘ Good-night ” at such times, though he said this regularly when left alone finally in the evening. Every one who has had acquaintance with one of the larger and more intelligent Parrots will recollect instances like this, and if Parrots do not develop a higher degree of rational conversation than they do, this is partly due to the fault of their teachers, as well as to the paucity of ideas one would expect in one of the lower animals. __ Other talking birds, such as Mynahs, Ravens, etc., seem not to be so rational in their conversation as Parrots, however good their enunciation may be, and though I have heard Mynahs make some astonishingly apposite-sounding remarks, this result always seemed to me to be purely accidental, and not due to the attempt to really utilize speech as Parrot sometimes do. In Parrots at all events talking power has nothing to do with sex, for female birds talk just as well as males ; in fact, one experienced dealer, Mr. C. P. Arthur, who is also a taxidermist and has thus dissected many of the well-known African Grey Parrots, states that in his experience he never came across a male of this species. ‘This may have to do with the fact—if it is a fact—that Parrots MUSICAL FEMALE BIRDS 289 are not naturally mockers, but only develop the imitative habit under human control and cultiva- tion; for, as every one knows, Passerine birds, to which all other talking and mocking species belong, generally only sing when of the male sex. And though to this there are numerous exceptions, of which the hen of the beautiful Red Cardinal of America (Cardinalis cardinalis) is perhaps the best known, still there is no hen bird which sings better than her mate, and none which sings while the male is mute; though, as we have seen in the case of the Ducks, and as is also the case with the Guinea- Fowl, the female may have a much stronger voice than the male. In these cases, however, he is still much more loquacious than she is, and although his voice to us sounds weaker, her ear may be more attuned to it. There are some curious cases of coincidental resemblances between voices of unrelated birds and between sounds made by birds and by mammals and even produced by mechanical means, which deserve attention. Many people must have noticed the great resemblance between the piping call of the Kingfisher and that of the common Sandpiper, and between the note of the Kestrel and that of the Wryneck. I have noted others in cases where the birds do not occupy the same country, at any rate when breeding ; thus the pretty Wire-tailed Swallow (Hirundo smithit) of Africa and India has exactly the same call-note “‘ swee-et ”’ as the Canary, an Azorean species; and an Australian Dove i 290 BIRD BEHAVIOUR (Geopelia humeralis) has one note exactly like that ' of the common Cuckoo. Cuckoos themselves are just as remarkable for curlous notes as for parasitism and for resemblances in appearance to birds of alien families; thus we have the well-known “ Brain-fever-bird” of India (Hierococcyx varius), with its strange tri- syllabic notes running up the scale, and preceded by an overture, while the dissyllabic note of the Koel (Eudynamis honorata) also runs up the scale. Our own Cuckoo’s note is known to be so truly musical that it can be imitated easily by mechanical means and even struck on the piano, and as every one knows is so readily rendered by the human voice that “ early Cuckoos”’ are always regarded with grave suspicion. , Nightjars also have many strange notes, the machine-like whirring of our familiar species being rivalled by the singular sound produced by a common Indian species (Caprimulgus indicus), which is just like the sound of a stone bounced along ice ; and the human-sounding notes of the American “ Whip-poor-will” (Caprimulgus vociferus) have long been celebrated. Other mammalian voices besides man’s come in for this fortuitous imitation; the roar of the cock Ostrich is not unlike that of the lion, and the American Cat-bird (Galeoscoptes carolinensis), which is a Mocking-Thrush, and the Australian Cat-bird (4luredus viridis), one of the Bower-birds, have ' obtained their names from their cat-calls, while COINCIDENCE IN THOUGHT 291 the Eagle yelps like a little dog, and the Bittern bellows like a bull. Resemblances to mechanical sounds are also curiously common elsewhere than among Night- jars; the Coppersmith Barbet’s note is just like a little gong regularly beaten; and the Naked- throated Bell-bird (Chasmorhynchus nudtcollts) of South America has a really magnificent me- tallic clang, like a bar of iron struck with a rod, which, overpowering though it is close at hand, is, I think, at a reasonable distance, the finest bird note I have ever heard. The more celebrated Bell- bird proper (C. niveus), whose note is said to be like a church bell, is nearly related. Old legends and fairy-tales are full of allusions to people who could understand the speech of birds, and, quite apart from talking birds which un- doubtedly do at times make their linguistic acquire- ments serve their ends, there seems to me con- siderable possibility of men understanding the notes and gestures of birds at least as well as these do each other. A man and a bird may have the same idea at once; thus, just before I saw the Song-Thrush above-mentioned catch the minnow, I remember thinking, “‘ I wonder if that bird could catch one of those fish;”’ and on the first occasion on which I saw a Peahen take distinct notice of a Peacock’s display, gazing attentively at his train, the Peacock and I both had the same idea—that the favourable moment had come; and we were both mistaken, and mistaken twice in quick succession. 292 BIRD BEHAVIOUR In watching waterfowl I have had similar experi- ences ; at the time of writing the waterfowl at St. James’s Park were restricted to a comparatively small area of water at the east end of the park, the rest of the pond being drained, and the young Mallard ducklings have been coming close up to the path to be fed. An old Duck, watching her brood with anxious quacks, gave an extra loud one as a Canadian Goose came too near them for her satisfaction, and the ducklings bolted helter-skelter into the pond. Now it was perfectly obvious that all the old Duck meant to say was “‘ Keep away from that Goose ’’—a few feet’s retirement would have been sufficient ; but all her vocabulary allowed © was ‘‘ danger,” and the ducklings promptly acted on the word. Here I could understand the Duck, - but the ducklings could not; in another case a drake and I were both at a loss. A pair of Man- darin Ducks were, at a dealer’s, confined in a hutch with perches, and were roosting on the top one. The duck started pulling at the drake’s crest until she fairly upset him, and he fell to the floor; but when he mounted again she let him alone, being now next the wall, and it became obvious to me that she wanted the inside berth, was not active enough to jump over him, and could not explain to him any more than to me that she wanted him to get out of her way. CHAPTER XI Weapons and fighting methods of birds—Their combats with each other and with various natural enemies—Chief enemies of birds—The passive resistance of birds to unfavourable climate and surroundings—Natural defences—Perfection and degeneracy of plumage in this connection—Powder-coating of some groups. In the state of war in which birds, like other wild creatures, perforce exist, they are naturally often called upon to fight, though better qualified, by their general power of flight, for escaping than most other creatures; and it is noticeable that some of the most formidable fighters are found amongst those in which the power of flight 1s wanting or not highly developed—the great running- birds and the Game-bird tribe. The Ostrich holds its own among the African quadrupeds by dint of the power of its great feet, the single claw on the longer of its two toes being such a terrible weapon that it can pierce corrugated iron; and any beast | up to the size of a hyzena has to avoid the Ostrich’s wrath. These great birds draw themselves up and strike out with one foot, the Emu and Cassowary being very formidable kickers as well as the Ostrich. In the Cassowaries one of the claws, the innermost, is specialized as a weapon, being unusually long 293 294. BIRD BEHAVIOUR and straight; and the native tribes which inhabit regions where these birds live use it as a head for their spears. The Rheas fight with bill as well as pies holding on like bull-dogs, and bill- and foc Aenea is the rule among the Game-birds ; every observer must have seen how fighting cocks strive to get a hold - with the bill and with that purchase to deliver a telling blow with the spurred legs. It is only among the Game-birds that spurs on the leg occur at all, and they are generally single, and normally confined to the male, as in the Fowl, Turkey, and common Peacock; but there are several groups in which the cock has two or more spurs on each leg, such as some of the African Francolin Part- ridges (Pternistes) and the Asiatic Spur-Fowls (Galloperdix) with two, the females of the latter having one ; the Peacock-Pheasants (Polyplectron) and Blood-Pheasants (Ithagenes) have variable numbers in the male birds, in the common Himalayan Blood-Pheasant the cock having up to four on one leg and five on the other; while I notice that in three wild-bred and fully adult cock Grey Peacock-Pheasants (P. chinguts) in the London Zoo at present one bird has two spurs on each leg, one one on one leg, and the third none, from which I argue that such multiple spurs do not seem to be of much use. Besides the hen Spur-Fowls, the hens of the Crestless Pheasants (4comus) and of the Javan Pea-Fowl are spurred as well as the cocks. The long single spurs seen in the Fowl and some FIGHTING QUALIFICATIONS = 295 similar birds are really terrible weapons ; the wild Jungle-Fowl is a terrible fighter for his size, and his least-modified tame descendant the game- cock, a professional gladiator, has even been known to kill a fox, this supreme gallinaceous exploit having been chronicled in a sporting magazine about a hundred years ago. Ceylon Jungle-Fowl can beat ordinary tame Fowls, and the common Indian red one has been seen to thrash a Kaleege Pheasant (Genneus), which is more than a match for our Pheasants. So is the little wiry Gold Pheasant, curiously enough, a result which must be due to his extreme activity, since his spurs are rudimentary. The springing necessary in birds which fight with both feet at once, as these do, gives of course a great advantage to the more active bird if other qualifications are anywhere near equal; the average heavy tame Cock cannot beat the common Pheasant, though the Jungle-Fowl can do so. Besides the slayer of Reynard, another game-cock, recorded in Teget- meier’s poultry-book, has won fame by killing a Kite, and even the game-hen, as Wright’s poultry- book relates, has been known to kill a rat, a Rook, and even a Hawk. As Mr. MacDonald, the pheasant-keeper at the Zoo, gave me an opportunity of observing, the Glo- bose Curassow Cock (Crax globicera) when attacking his attendant’s foot, did not strike, but gripped with the claws and bit, thus showing a method of attack more like that of a Passerine bird, and to these 296 BIRD BEHAVIOUR perchers the Curassow and Guan family show a slight approximation in form and habits, being the least specialized of Game-birds. The grappling unscientific method of fighting is very marked in Passerine birds, whose fights are regular ‘‘tooth- and-claw’’ performances. Rails, such as our Moorhen and Coot, also grapple in this way. The Game-birds, especially Grouse, use their wings as well as their beaks and feet in fighting, but the most notable wing-fighters are the Pigeons, the Duck tribe, the Plovers and Snipes, and the Pen- guins. Some of these groups are regular professional boxers, and may be even armed with knuckle-dusters, as the Sheldrakes and that giant extinct flightless Pigeon, the Solitaire (Pezophaps solitarius) of Ro- driguez ; or have spurs on the pinion-joint, as in the Spur-wing Geese (Plectropterus) and Spur-winged Lapwings of several kinds, besides the “‘lily-trotting”’ Jagan4s, several of which are spur-winged. ‘The Screamers have two spurs on each wing—a large one on the pinion, and a smaller one nearer the tip of the wing. All spur-winged birds are spurred in both sexes, and in none of them do the spurs represent claws, being never at the ends of the digits. The Torrent-Ducks (Merganetia) of the Andes have spurs on the wings, but here it is just possible that these may be grappling-irons for climbing slippery rocks, as the New Zealand Tor- rent-Duck (Hymenolemus malacorhynchus) is said to use its wings for scrambling up rocks, though in this species they are only knobbed, not spurred. $e watering young, 102 Sand-pipers, laying in old nests of other birds, 186 Satin-bird, preference for blue, 308 Scissor-bills, exaggeration of tern type, 221 Screamers, padded armour of, . 299 Secretary-bird, feeding habits of, 61; weak flight of, 32 Seed-Snipes, bathing habits, 314; vegetable feeders, 34 Sexual selection, 241 Shag, swallowing under water, 100 Shama, its excellence of song, 216 INDEX Shearwaters mistaken for Swifts by Pliny, 323 Sheldrakes, their dislike for Geese, 275; diving when young, 126; nesting inrabbit holes, 185 Shoveller Duck, mode of feed- ing, 37; speed of flight, 28 Shrikes, mocking instinct, 285 ; spearing prey alive, 309 Skuas, piratical habits, 312 Snail-Hawk, peculiar diet and structure, 60 Snake-bird, mame given to Darters, 19 Snakes, their sloughs used as nest-linings, 311 Snipe, action of beak in, 41; differencein commonand Pin- tail species, 42 ; Song-Thrush, catching a fish, 72 Sparrow, imitating song bird, 7 ; versatility of, 4, 7 ‘Spine-tail Swifts, speed of, 29: _ Spoonbill, feeding method of, 44; hybrid with Ibis, 44 Spot-bill Duck, breeding with Mallard, 241; speedofflight, 28 Spurs of birds, 294, 296 Starling, honey-sucking habit acquired by, 84; relations to insects, 237 Steamer-Duck, mode of progres- sion, 27 Storks, friendly with man, 347 ; mode of feeding young, 119 Storm-Petrel, large egg of, 149; long incubation, 159 Sugar-bird, honey-eater related to Tanagers, 84 Sun-birds, diet, 82; feigning death, nests, 178; preying on lizards, 72 Sun-bittern, nestling, 130 ; mud nest, 184 Swallow-Plovers as locust-des- troyers, 74. Swallows, perishing through de-- lay, 210; relations with man, 347 Swans, carrying young, I14; pulling food for them, 127 INDEX Swifts, distinctions from Swa- lows, 9; power of rising, 26; pugnacity of, 298 Tailor-bird, peculiarities of nest, 179 Tanagers, imperfect digestion in some, 91; feeding Cuckoo, 189 Terns, feeding females, 110; universal distribution of, 221 Thrushes, pre-eminent as song- sters, 217 Tinamou, beautiful eggs of, 143; exceptional roosting habit, 317 Tinker, small barbet parasitized by Honey-guide, 198 Tits holding down food when feeding, 87; storage instinct in, 309 Toilet customs, 313 Tongue, structure and func- tions of, 77 Toucans, eating mixed diet, 35 Touracous, young of, 133 Tragopans, precocious fledging of, 122 Trogons, differences in diet ac- cording to distribution, 35 Tropic-birds, flight of, 31 Tui, mocking New Zealand Honey-eater, 283 Turkey, display of, 323 ; gizzard of, 93; gluttony of, 67 Turnstone, its habits and mus- cular strength, 42; wide dis- tribution, 220 Varro, on birds shown in Rome, a54, Vegetarian families of birds, 34 Vultures, eating fruit, 34; not sO voracious as imagined, 68 363 Warblers, grey, rearing cuckoos in New Zealand, 193 Wax-myrtle, berries eaten by Swallows, 34 Waxwing, northern berry-eater, 209 Weavers, skilful nesters, 175; stronger than typical finches, 215; tenement nest, 279 Weka, destructive to eggs and chicks, 62; uses foot in feed- ing, 89 Whale-birds, peculiar Petrels, 40 Wheatear, colonizing Alaska, 224 Whip-poor-will, note, 290 Whitebeam berries, much fa- voured by birds, 70 Woodcock, carrying young, 128 Wood-hoopoes, their peculiari- ties, 50 Woodpeckers, eating fruit, 52; sucking sap, 52; young, 251 characteristic Wood-Pigeon, intense greedi- ness of, 66 Worms, little liked by many birds, 71 Wry-billed Plover, unique eS Zealand form, 42 Wryneck, induced to excessive egg-production, I51; as witches’ charm, 80 Xenophon, on riding down Bus- tards, 32 Yellow-billed Duck, breeding with Mallard, 241 Zebra-Finch, its change of colour in bill, 327 Zulus, their rendering of a Nightjar’s note, 254 PRINTED BY HAZELL, WATSON AND VINEY, LD., LONDON AND AYLESBURY. © tee ET te re ae Cm os aoa ss S * M, 4 a Y ' y aac Me ee 49 LIBRARY OF CONGRESS NAAM 0 005 486 636 7