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A
ALEXANDER WILSON
THE FATHER OF AMERICAN ORNITHOLOGY.
From a drawing in the possession of the Academy of Natural Sciences of Philadelphia,
formerly the property of George Ord.
L
Su
PYSIZ
BIRDS
THE
BIRDS OF EASTERN PENNSYLVANIA
AND
NEW JERSEY.
WITH INTRODUCTORY CHAPTERS ON
GEOGRAPHICAL DISTRIBUTION AND MIGRATION
PREPARED UNDER THE DIRECTION OF THE
DELAWARE VALLEY ORNITHOLOGICAL CLUB
BY
WITMER STONE
Conservator Ornithological Section Academy of Natural Sciences of Philadelphia
PHILADELPHIA
DELAWARE VALLEY ORNITHOLOGICAL CLUB
1894
Agqgonlan Institge> |
és - %
e@ JUL 29 1913
CHEAT 4B |
ational ise So
Soon after the organization of the Delaware Valley Ornithological
Club in 1890, steps were taken to compile from the field notes of the
members a list of the birds known by them to occur in the vicinity
of Philadelphia, to serve as a nucleus for a future publication.
At a meeting of the Club held on February 2, 1892, a committee
of three was appointed to take the matter in hand and to prepare a
work, which should embody in a compact form, all the important
results of the Club’s ornithological investigations, in connection with
a correct list of the birds to be found in the Delaware Valley and
along the New Jersey seacoast.
The Committee entered immediately upon its duties, and it was
agreed that the preparation and editing of the work should be en-
trusted to Mr. Stone, he having already collected a large amount of
data, while the other members should confer with him and examine
and revise the manuscript as the work progressed.
The Committee issued two circulars to ornithologists and sports-
men, calling for information, and received a large number of replies.
From time to time it reported progress to the Club, delaying a final
report, with the object of obtaining as much information as possible
upon the work in hand.
At a meeting of the Club held May 17, 1894, the final report was
submitted, and the committee was continued with full authority to
proceed with the publication of the work, which is herewith pre-
sented.
GEORGE SPENCER ee
SamMuEL N. Ruwoaps, Committee.
WITMER STONE. j
PHILADELPHIA, November 1, 1894.
(iii)
PREFACE.
THE object of the present publication is to provide the members
of the Delaware Valley Ornithological Club, as well as other orni-
tholigists of Eastern Pennsylvania and New Jersey, with a summary
of our present knowledge of the birds of this district with regard to
their abundance, distribution and time of occurrence; as well as to
furnish a work of reference for ornithologists in general on the birds
of these States.
No attempt is made to describe birds nor to treat of their habits,
these matters being fully considered in the more general works on
North American Ornithology to which the present volume should be
considered supplementary—treating only of the status of the various
species of birds as members of the Fauna of Eastern Pennsylvania
and New Jersey.
We have endeavored to make the work as complete as possible, and
besides presenting a large amount of hitherto unpublished matter,
have brought together in one volume ail the more important infor-
mation contained in the various published lists and scattered notes
on the birds of this district.
Recognizing the importance of a knowledge of the subjects of geo-
graphical distribution and migration of birds to the ornithologist of
to-day and the increased value which attaches to his observations
from the possession of such a knowledge, we have prepared a brief
general outline of these subjects and a more detailed treatment of
them with reference to the region under consideration. These chap-
ters will, we hope, prove of value in turning the attention of begin-
ners in the study of our birds, to these important lines of investiga-
tion.
In compiling the main portion of the work, the author has to
express his thanks to the members of the Delaware Valley Ornitho-
logical Club for their valuable assistance in placing their notes and
collections at his disposal; and especially is he indebted to Messrs.
George S. Morris and Samuel N. Rhoads, his fellow-members of the
(v)
vi PREFACE.
Committee on Publication, who have continually aided him with
their assistance and advice.
To Dr. C. Hart Merriam his thanks are also due for the permission
to examine the lists of birds, known to breed at various points in Penn-
sylvania and New Jersey, which have been compiled by correspond-
ents of the U. S. Department of Agriculture: to Dr. Edward J.
Nolan, Librarian of the Academy of Natural Sciences of Philadel-
phia, for permission to publish the portrait of Alexander Wilson,
which appears as a frontispiece; also to Dr. J. A. Allen and Mr.
Frank M. Chapman, of the American Museum of Natural History,
Mr. Robert Ridgway of the U. S. National Museum, and to the
many correspondents in various parts of Pennsylvania and New
Jersey—especially Messrs. August Koch, Josiah Hoopes, Philip
Laurent, Prof. H. J. Roddy and Dr. J. W. Detwiler, who have so
courteously rendered their assistance in the preparation of the pres-
ent volume.
WITMER STONE.
AcADEMY OF NATURAL SCIENCES,
Philadelphia, November 6, 1894.
CONTENTS.
PAGE
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EARN GH Few eieiho tie ok iuibc entre: cons Rune Neel reve rarck vo soain ch cniret urstege: had v
Part I. GEOGRAPHICAL DISTRIBUTION OF BrRDS........ 3
FAUNAL AREAS OF EASTERN PENNSYLVANIA AND NEW
SRR SHV Aotees = rh Poy tal ce eA ede Pants, (tt ediel velo oie sible tf
WETNESS pyr temic ah ceiier tren tay Nap vei eilcelate. vs tae Mastononnera teil
BTM) MTGRAMTON hace sist Shao eee eve el eects i LO
MIGRATION IN THE VICINITY OF PHILADELPHIA .... 19
Birps FOUND WITHIN TEN MILES OF PHILADELPHIA... 28
PARTE INTRODUCTORY, LH XPLANATIONS. 4 6 6 a) sue «061 eos 3) CO
ANNOTATED List OF BrrDs OF EASTERN PENNSYLVANIA
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PART I.
ee
GEOGRAPHICAL DISTRIBUTION
OE api LS
BIRD MIGRATION.
CONSIDERED IN GENERAL AND WITH SPECIAL REFERENCE
TO PENNSYLVANIA AND NEW JERSEY.
ui
aA
‘2
“h
I. GEOGRAPHICAL DISTRIBUTION OF BIRDS.
GENERAL LAWS OF GEOGRAPHICAL DISTRIBUTION.*
Tue true home of a bird is the locality where it breeds; where the
food and surroundings are best suited for its existence, and where it
would probably remain permanently were it not for the changes due
to the approach of winter, which drive it southward to a more con-
genial clime until the return of spring makes its home once more
habitable.
In the wide extent of country through which a bird passes during
its migrations, it is but a transient visitor, and is obviously not to be
considered as one of the species native to that section.
It is evident then that all study of the distribution of bird life, and
the laws which govern it, must be made during the breeding season,
when all birds may be considered at home.
The distribution of birds, it should be remembered, is subject to
the same general laws that govern the distribution of other animals,
as well as plants. That is to say, where the conditions of climate
and environment are suitable to the existence of certain species of
birds, there we shall find certain species of mammals and plants ;
and where the character of bird life is decidedly different, there we
may confidently expect a different flora. It can thus be easily seen
how intimately related are the studies of the distribution of animals
and plants, and how much aid they are likely to prove to one another.
The distribution of life is dependent either directly or indirectly upon
climate, the differences in the tropical, temperate and polar faunas
* The following papers should be consulted for a full discussion of this ques-
tion :
J. A. Allen, ‘On the Mammals and Water Birds of East Florida * * *
And a Sketch of the Bird-Faunze of Eastern North America.’—Bull. Mus.
Comp. Zool., II., p. 161.
Dr. C. Hart Merriam, ‘“ Results of a Biological Survey of the San Francisco
Mountain Region and Desert of the Little Colorado, Arizona” (Part I.).—North
Amer. Fauna, No. 3.
J. A. Allen, “Origin and Distribution of North American Birds.”—The
Auk, 1893, p. 97.
(3)
a
being well known instances. In different continents or countries far
separated, the faunas and floras are usually radically different, being
derived from different stocks ; but in them all successive climatic
zones of life will be experienced in passing in a general north or
south direction.
A careful study of the breeding ranges of the birds of Eastern
North America has clearly demonstrated this as regards our con-
tinent. The northern and southern limits of the breeding ranges of
the various species fall along certain more or less distinct lines,
where there are likewise decided changes in the flora as well as in
the climate and general character of the country. In this manner
the continent may be separated into several parallel zones, each of
which marks the northern and southern limit of the breeding range
of certain species.
Besides the Tropical Realm which reaches the coast of southern
Florida, and the circumpolar Arctic Realm, five life zones are clearly
marked in eastern North America. These are known as the (1)
Louisianian, (2) Carolinian, (3) Alleghanian, (4) Canadian, (5) Hud-
sonian. Now it must not be supposed that the boundaries of these
zones compare in any way with the regularity of the parallels of
latitude, for they are, on the contrary, exceedingly broken and ir-
regular. This is of course due to the topography of the country, as
the elevated mountain ranges and plateaus, having of necessity a
cooler climate than the surrounding lowlands, carry a more northern
fauna and flora far southward, while on the other hand low open river
valleys are always milder in climate, and thus furnish avenues by
whick the southern animals and plants extend their distribution
northward. We therefore find the boundaries of these “ life zones ”
extending up and down in a zig-zag manner as they follow the vary-
ing irregularities of the land. These irregularities of surface fre-
quently make the lines of separation between one zone and another
all the more strongly marked, since on the precipitous side of a
mountain the change of climate as one ascends is much more rapid
than is experienced in traveling northward on the level. The
change in the vegetation is similarly sudden, the line between the
coniferous and deciduous forests being usually quite apparent, and
with the change in vegetation comes a corresponding change in the
birds and other animals.
Of the four life zones already mentioned, three pass through
Pennsylvania and New Jersey. The Carolinian Zone occupies the
5
whole of southern New Jersey and extends northward in a contin-
ually narrowing strip along the whole coast, terminating in narrow
offshoots into the valley of the Hudson and Connecticut Rivers.
In Pennsylvania it occupies the whole south-eastern corner of the
state and pushes up the valley of the Susquehanna, following its
tributaries into the low ground between the first ridges of the
Alleghanies.
To the southward the Carolinian Zone sweeps along parallel to
the mountains, and, rounding their southern extremity, bends north
again, spreading over the upper Mississippi and Ohio Valleys, and
again enters Pennsylvania in the south-western counties.
The same species of birds are found breeding throughout this area,
though the presence, or, at least, abundance of certain species at par-
ticular localities is often dependent on the local environment. Gen-
erally speaking, however, a list of the breeding birds of any locality
within the zone will correspond very closely with a similar list from
any other station within its boundaries.
Certain birds do not range north of the Carolinian Zone, and are,
therefore, useful in determining more exactly its northern boundary.
Such are the Acadian Flycatcher, Cardinal, Worm-eating Warbler,
Blue-winged Warbler, Kentucky Warbler, Yellow breasted Chat,
Carolina Wren, Tufted Titmouse, and others. The presence of any
of these during the breeding season indicates a Carolinian element in
the fauna of the locality.
The Alleghanian Zone, lying immediately north of the Carolinian,
embraces all of the states of Pennsylvania and New Jersey not in-
cluded in the latter, except the tops of the higher mountain ranges
and portions of the elevated table land in the north central part of
Pennsylvania. Generally speaking, this includes the entire breadth
of the Appalachian mountain system in these two states, except the
highest ridges already alluded to. The Alleghany Mountains (ex-
cept the high ridges) to their southern extremity belong to this zone,
and to the north it includes most of New York and New England
and the valley of the St. Lawrence, as well as southern Michigan,
Wisconsin and Minnesota.
The Alleghanian Zone forms the northern limit to the range of
the following species, which occur regularly within its boundaries,
though they are much more abundant in the Carolinian Zone, @. e.,
the Wood Thrush, Brown Thrasher, House Wren, Field Sparrow,
Chewink and Dove.
6
The Chestnut-sided Warbler, Rose-breasted Grosbeak, Least Fly-
catcher, Wilson’s Thrush and Savanna Sparrow are also found
breeding in the Alleghanian Zone, none of which occur, except as
migrants, in the Carolinian Belt. The Scarlet Tanager, Black and
White Warbler and Redstart are also characteristic species of the
Alleghanian Zone, and, though they breed also in the Carolinian, are
less abundant there.
The Canadian Zone occupies in Pennsylvania only the tops of the
highest mountains and the elevated plateau region, where the deep
hemlock forests, with their cold brooks and dense shade, still remain
undisturbed. The passage from the Alleghanian to the Canadian
Zone is here, as arule, remarkably distinct, as the more northern
birds keep strictly to the virgin forest, the cool shade of which affords
them a congenial summer home. Where the forest has been re-
moved the Canadian species for the most part disappear, and, judg-
ing from present indications, it would seem that this element in our
fauna, which once undoubtedly extended over a much greater area
than at present, may soon almost entirely disappear, as the lumber-
men year by year encroach upon the forest tracts.
The Canadian Zone, as exhibited in the Alleghanies, consists of a
series of isolated patches or “islands,” which are quite separated
from the main portion of the zone in the north, the elevation above
the sea level in the isolated portions producing climatic conditions
similar to those experienced in the lowlands at more northern lati-
tudes. In addition to the mountain tops of Pennsylvania, Virginia
and North Carolina, the Canadian Zone includes the Catskills and
Adirondacks, while the main portion of the zone stretches from the
White Mountains and Maine north to southern Labrador and New-
foundland, and northwest to southern Alaska. Between the Cana-
dian and the Arctic lies the Hudsonian Zone.
Birds which characterize the Canadian Zone in the breeding season
are the Canadian, Black-throated Blue, Blackburnian and Magnolia
Warblers, the Winter Wren, Brown Creeper, Hermit and Olive-
backed Thrushes. Many other species breed regularly in the more
northern portion of the zone, such as the White-throated Sparrow,
Three-toed Woodpecker, Tree Sparrow, Fox Sparrow, etc., but none
of these have yet been found breeding either in the Pennsylvania
mountains or farther south.
FAUNAL AREAS OF EASTERN PENNSYLVANIA AND NEW JERSEY—
THEIR PHYSICAL FEATURES AND CHARACTERISTIC BIRDS.
The three great faunal zones which pass through Pennsylvania
and New Jersey may be divided into several well-defined regions,
which differ more or less in their physical features and consequently
in the character of their bird life.
In southern New Jersey two principal regions may be recognized,
the Maritime Marshes and the Pine Barrens, with their Cedar
Swamps, while as we pass westward through Pennsylvania there are
the valleys of the Delaware, Schuylkill and Susquehanna—all of
these are included in the Carolinian Zone. Farther north and
northwest, between the large river valleys, are the Interior Uplands,
where the Carolinian birds begin to disappear. Then follow the
Blue Mountain range and the various detached ridges and foot hills
of the Appalachian system, where the Alleghanian element is first
met with, and finally the Alleghany mountain proper, capped with the
deep Canadian hemlock forests.
The Maritime Marshes——The great salt marshes of New Jersey
stretch along the coast for one hundred miles, from Cape May to the
head of Barnegat Bay, averaging about two miles in width in the
lower portion and gradually narrowing northward. On the ocean
side they are bordered by a narrow line of sand-hills which separates
them from the low, shelving beach. Several large bays and sounds
intervene between the marshes and the sand-hills, communicating
with the ocean by narrow inlets. At several points the bays stretch
back and carry the marshes several miles inland, as along the Great
Egg Harbor and Mullica Rivers. The coast sand-hills sometimes
become wide enough to support a scanty growth of Pines ( Pinus
rigida), and Scrub Oaks (Quercus ilicifolia and Q. nigra), in which
the Fish Crows and Fish Hawks nest, while everywhere they are
covered with a thick growth of Bay-berry (Myrica cerifera), and in
this shelter a few Song Sparrows and Maryland Yellow-throats spend
the summer,
The marshes themselves present throughout an even expanse of
green sedges and marsh grasses, with a thick carpet of Salicornia.
Everywhere thoroughfares and creeks of varying width wind their
way in and out in an endless tangle, and at low tide their muddy
banks and exposed flats form favorite feeding grounds for the migrat-
ing ‘* shore birds ” and the Clapper Rails which nest on the marshes.
8
‘In addition to the Rails, the most characteristic summer birds of the
marshes are the Sharp-tailed and Seaside Sparrows, which breed
everywhere in abundance. These three birds constitute the entire
bird life of the salt marshes in summer, with the exception of a few
Herons which resort there to feed. Nearer the mainland, however,
where the water is not so salt and patches of cat-tails occur, Marsh
Wrens, Red-winged Blackbirds and other species may be found
breeding.
The Common Tern and Laughing Gull used to share the marshes
with the Rails and Sparrows during the breeding season, but along
with the Piping Plovers, Least Terns and Skimmers which used to
breed regularly along the New Jersey coast, they have almost en-
tirely disappeared, and only a few pairs are now to be seen during
the summer.
The Pine Barrens.—Behind the marshes and occupying all of
southern New Jersey, south of a line from Long Branch to Salem,
lies the characteristic Pine Barren Region—the northern extremity
of the great Atlantic Plain. This is a low, flat, sandy district, varied
here and there with outcrops of yellow gravel and with numerous
swamps scattered about throughout its extent. Some portions are
mere dry wastes of loose sand supporting a scant growth of low Pines
and Scrub Oaks, while in other sections are vast forests of tall Pitch
Pines (Pinus rigida). Were and there are open cranberry bogs and
small tracts of cultivated land.
In the forests the Pine Warbler is the most characteristic species
of bird, while several species of Woodpeckers and the Great Horned
Owls here find a congenial home. In the lower scrub growth, es-
pecially on the borders of the swamps, Chewinks and Prairie Warblers
abound, together with Wood Pewees and Kingbirds.
The Cedar Swamps.—The swamps, however, harbor the great-
est variety of birds, and furnish a most interesting field for the
ornithologist.
These swamps are generally covered with a dense growth of White
Cedar (Chamecyparis thyoides), mingled here and there with
patches of Red Maple, Pepper Bush (Clethra alnifolia), Magnolia
(M. glauca) and Holly, making an almost impenetrable jungle.
Here and there occur shallow ponds or lakes, which seem to have
overflowed considerable areas of older thickets. The dead and
rotten branches of the submerged trees and bushes everywhere raise
their gaunt shapes from the dark water stained with the accumu-
9
lated vegetable matter, and upon them hang dense festoons of the
gray beard-moss (Usnea barbata). Here the Parula Warblers
abound, darting about among the tufts of moss in which their dainty
nests are so securely hidden. MHere, too, the clear note of the
Hooded Warbler is heard throughout the nesting season, though this
species is perhaps more plentiful in the holly thickets on the edge of
the swamps. Cardinals and Catbirds are also at home in these
thickets, and the anxious cries of the Carolina Chickadee frequently
greet the ear. Probably the most characteristic bird of the swamps,
however, is the White-eyed Vireo, whose clear and somewhat
monotonus song is heard continually.
It is in the Pine Barren Region of New Jersey that an occasional
Blue-gray Gnatcatcher or Mockingbird is most likely to be found,
though both these birds are very scarce in this state, as well as in
Pennsylvania.
The Lowlands of Pennsylvania.—South-eastern Pennsylvania is
cut off sharply from the mountainous parts of the state by the
Kittatinny or Blue Mountain, which extends in a nearly straight line
from the Delaware Water Gap to the middle of Cumberland county,
where it bends to the southward and crosses the Maryland boundary.
The country to the south of this ridge is an undulating slope, com-
prising the valleys of the Delaware, Schuylkill and Susquehanna, and
the slightly more elevated ground between them. North of these
valleys, and immediately below the Blue Mountain, there is also a
long valley extending diagonally across the state from north-east to
south-west. The lower end of this valley
bounded on the south by another ridge, known as the South Moun-
tain, and the same ridge reappears between Reading and Easton.
Cumberland Valley—is
In the intervening part, however, the more northern valley passes
imperceptibly into the lowlands to the south.
Besides the South Mountain and its eastern extension the prin-
cipal elevations in south-eastern Pennsylvania are the Welsh Moun-
tain, Copper Mine Ridge and North Valley Hills, in Lancaster and
Chester counties.
The greater part of New Jersey, north of the Pine Barrens, is
identical with this portion of Pennsylvania in its fauna.
The characteristics of the several divisions of this region are as
follows:
The Delaware Valley.—The country lying on each side of the
Delaware River, including in New Jersey a narrow strip bounded on
10 :
the east by the Pine Barrens and stretching from Bucks to Chester
county in Pennsylvania, and drained by the Delaware, Schuylkill
and Brandywine, has quite a uniform bird fauna. It consists mainly
of an open farming district, with interspersed patches of oak and
chestnut woodland and occasional clumps of Red Cedar (Juniperus
virginiana), while on some of ‘the steeper banks of the rivers and
creeks, on the Pennsylvania side, are scanty growths of Hemlock.
The flat meadows below Philadelphia contain numerous open swamps
and patches of woodland composed of Oak, together with Sweet
Gum, Magnolia and Pepperbush, which recall the New Jersey
swamps.
Asa complete list of the birds which breed in the Delaware Valley
will be found elsewhere, it is only necessary in this connection to
mention the regular occurrence in suitable localities throughout this
district of such distinctively Carolinian species as the Turkey Vul-
ture, Barn Owl, Acadian Flycatcher, Cardinal, Rough-winged
Swallow, Blue-winged Warbler, Kentucky Warbler, Worm-eating
Warbler, Yellow-breasted Chat, Carolina Wren and Tufted Tit-
mouse.
An occasional pair of Redstarts and Least Flycatchers remain
here to breed, though the majority of them do not summer south of
the Alleghanian zone.
The Susquehanna Valley.—The valley of the Susquehanna, stretch-
ing back from Chesapeake Bay, enters Pennsylvania in York and
Lancaster counties and carries many southern plants and birds north-
ward in abundance which are rare or unknown in the higher ground
on either side. The deep hemlock woods which cover the steep and
rocky banks of the river remind one strongly of the mountain forests
of the Alleghanies, but we find no trace of mountain birds to com-
plete the resemblance, although a few northern species of plants do
occur.* The character of the bird fauna, though practically identi-
cal with that of the country to the east, is probably rather more
Carolinian. No species occur, so far as is known, which are not also
found in other portions of southeastern Pennsylvania, but the dis-
tinctively Carolinian species are much more abundant than else-
where. Carolina Wrens seem to almost entirely replace the House
Wrens, and their loud whistle is continually to be heard. Cardinals,
Kentucky Warblers, Blue-winged Warblers and Worm-eating Warb-
lers abound, and Louisiana Water-Thrushes occupy the shaded rocky
* Sambucus pubens, etc.
Tt
ravines of the rapid tributary streams, while Turkey Vultures breed
among the rocks and congregate in numbers on the low sandy islands.
The Interior Uplands.—The bird fauna just described as charac-
terizing the lowlands of south-eastern Pennsylvania extends also
along the valleys between the Blue Mountain and South Mountain,
and some of the species penetrate even farther, following the course
of the larger rivers, and lend a Carolinian tinge to the fauna of the
valleys lying to the north of the Blue Mountain. Generally speak-
ing, however, the Carolinian element is not nearly so strongly
marked in the valleys north of South Mountain and its eastern
spurs, nor in the higher ground forming the water-sheds between
the drainage of the Delaware, Schuylkill and Susquehanna.
The first appearance of Alleghanian species, such as the Chestnut-
sided Warbler, and the increase in the numbers of species which are
more characteristic of the Alleghanian than of the Carolinian zone,
as, for instance, the Scarlet Tanager, Black and White Warbler, etc.,
is noticeable on the Welsh Mountain and Copper Mine Ridge in Lan-
caster county, and also in the eastern continuation of South Moun-
tain between Reading and Easton.
The Appalachian District.—Between the Blue Mountain and the
main crest of the Alleghanies is a series of sharp mountain ridges,
cut and broken by river valleys, mainly those of the Susquehanna
and its tributaries.
This region is Alleghanian in its fauna, and with it is to be con-
sidered the northwestern mountainous part of New Jersey. As has
already been said, a few Carolinian birds are to be found in some of
the valleys, especially the broad valley of the Susquehanna, but
generally speaking the region is truly Alleghanian and is character-
ized by the occurrence in summer of such species as the Chestnut-
sided Warbler, Purple Finch, Savanna Sparrow, Black-capped
Chickadee, ete., which are not known as breeders in the Carolinian
Belt.
The Alleghany and Pocono Mountains.—On the main Alleghany
mountain, extending from Susquehanna to Lycoming county, Pa.,
and thence southwards to Somerset county, on the plateau region
of north-central Pennsylvania and on the Pocono Mountain plateau,
which occupies the north-eastern corner of the State, there probably
existed a bird fauna almost the same as that of the Catskills in New
York, and decidedly Canadian in its affinities.
Now, however, the rapid destruction of the primeval hemlock
12
forest, which formerly covered these mountains, has in most places
driven away the more characteristic Canadian birds which were wont
to breed in the cool dark woods and deep rhododendron swamps.
Regarding the disappearance and present extent of the hemlock
forest, Mr. Dwight says:* ‘* There was a time when the mountains
of Pennsylvania .were clothed with unbroken forest, the cool re-
cesses of which afforded refuge for many species now found in re-
duced numbers in the few tracts of timber still untouched by the axe.
At the present time the plateau region is in many places covered
with farms, which often extend to the very crest line, and there is
little suggestive of the top of a mountain range. Bits of the original
forest, however, still remain in many places, and on North Mountain
(which includes a large section of plateau in or adjacent to the south-
ern part of Sullivan county) is found what is said to be the largest
body of timber remaining uncut in the whole State.”
As regards the general character of these forests, we cannot do
better than to quote from Mr. Dwight’s description of North
Mountain. He says:
‘The forest is truly primeval ; the hemlock, the yellow birch and
the maple are the characteristic trees, and attain great size. The
hemlocks are scattered in consideratle numbers through the forest,
and tower above it, their huge trunks often four or five feet in
diameter, marking them out as giants among their lesser brethren.
The underbrush is often dense, and everywhere great logs, covered
with moss, lie mouldering. Here and there you hear clear cold
brooks that seem to imitate the song of the Winter Wren that is
almost constantly heard along them. The drawling song of the
Black-throated Blue Warbler and the sprightly one of the Canadian
Warbler is heard on every hand. High up in the hemlocks the
drowsy sounds of the Black-throated Green Warbler are heard, and
the lively chatter of the Blackburnian Warbler catches the ear.”
Among other species which breed in these forests are the Cross-
bill, Snowbird, Magnolia Warbler, Small-billed Water-Thrush,
Brown Creeper, Golden-crowned Kinglet (?), Olive-backed Thrush
. and Hermit Thrush.
WINTER BIRDS.
As all species have certain limits within which they find a nesting
ground suitable to their requirements, so also they have more or less
* The Auk, 1892, p. 129.
13
definite winter habitats. The boundaries of the latter are, however,
influenced to a considerable extent by the severity of the season and
the abundance of suitable food. When the crop of berries has been
large and the weather during the early part of the season compara-
tively mild, many birds will winter farther north than they usually
do, and will often brave very severe weather later in the season.
Heavy snow storms, which completely cover the ground, and with it
the food of many species of birds, cause a sudden migration farther
south, where the ground is more open. It is on such occasions that
we are favored with flying visits from Redpolls, Snow Buntings and
other birds of the far north.
The distribution of birds in the Delaware Valley during the winter
months is by no means uniform, some localities being much more
frequented than others. The vicinity of the tide-water creeks on the
New Jersey side of the river seems to furnish the most favorable win-
ter quarters, while some of the dry uplands in Pennsylvania are
nearly destitute of birds during the winter season. About Philadel-
phia the Song Sparrows and Tree Sparrows are universally distri-
buted in low swampy tracts, the latter species usually in large flocks.
On the river marshes quite a number of Swamp Sparrows also asso-
ciate with them. Large flocks of Snowbirds, as well as flocks of
Goldfinches, Purple Finches and a few Pine Finches are always pres-
ent. White-breasted Nuthatches, Brown Creepers, Downy and Hairy
Woodpeckers, Black-capped and Carolina Chickadees and Tufted
Tits are generally distributed through woodland and orchards, and
in sheltered thickets occur Cardinals, White-throated Sparrows,
Carolina Wrens and Winter Wrens. Golden-crowned Kinglets also
winter regularly in many places, and Cedarbirds and Blue Jays are
generally to be found. Crows are very abundant all winter in
immense flights, passing to and from their roosts in the evening and
early morning. Hawks, too, occur in larger numbers in winter than
at other seasons, and, though pretty generally distributed, the river
meadows of Delaware county seem to be their great rendezvous.
Here, on any winter morning, large numbers may be seen perched
upon the solitary trees which dot the meadows, or lazily flapping out
from the patches of woodland where they have roosted during the
night. All the summer species are present, and in addition the
Pigeon Hawk, Peregrine and Black Hawk. None of these, however,
are very plentiful, and the Black Hawk is seldom seen far from the
river meadows. Some other birds are also nearly or quite restricted
14
to these meadows during the winter. Meadowlarks occur there
regularly in flocks, while over most of the higher ground a few miles
back they are absent from November to March. )
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