The evils which would follow such a course are, however, thoroughly

understood. The Ducks, in the first place, are encouraged in every

way. It is said that should one walk into a peasant's cabin and

preempt his cot as a nesting-site, the peasant would gladly give up

his bed to so valuable a visitor.

Ducks

[Illustration: 129.]

=129. American Merganser= (_Merganser americanus_). L. 25; B. from

nostril, 1.5; nostril midway between eye and tip of bill. _Ad._

[Male]. No band of streaks on breast; no crest. _Ad._ [Female]. and

_Yng._ _Chin white_; crown and throat reddish brown; rest of

underparts and speculum white; above and tail ashy.

Range.--North America; breeds from New Brunswick, rarely mountains of

Pennsylvania, Minnesota, and mountains of Colorado and California

northward; winters from Maine and British Columbia south to South

Carolina and southern California.

[Illustration: 130.]

=130. Red-breasted Merganser= (_Merganser serrator_). L. 22; B. from

nostril, 1.8; nostril nearer to eye than to tip of bill. _Ad._ [Male].

Breast with a broad cinnamon band streaked with black; head feathers

lengthened. _Ad._ [Female] _and Yng_. Crown grayish brown, washed with

rusty. Chin and throat paler; rest of underparts and speculum white:

back and tail ashy. _Notes._ When alarmed, several low, guttural

croaks. (Elliot.)

Range.--Northern hemisphere; breeds, in America, from New Brunswick

and northern Illinois north to Greenland and Alaska; winters from

southern breeding limits, south to Cuba and Lower California.

[Illustration: 131.]

=131. Hooded Merganser= (_Lophodytes cucullatus_). L. 17.5. _Ad._

[Male]. A large, circular black and white crest. _Ad._ [Female] _Yng._

A small cinnamon crest, head, neck and breast grayish brown; back,

blackish; belly white. _Notes._ "A hoarse croak, like a small edition

of that of the Red-breasted Merganser." (Elliot.)

Range.--North America from Cuba and Lower California north to Labrador

and Alaska; breeds locally throughout its range, chiefly in interior

of British America; winters from British Columbia, Illinois, and

Massachusetts southward.

[Illustration: 132.]

=132. Mallard= (_Anas boschas_). L. 23. Speculum (patch in wing)

purple bordered by black and _white_; under surface of wing pure

white. _Ad._ [Male]. Head green; breast chestnut, a white neck-ring.

_Ad._ [Female]. Above blackish and buffy, below rusty buff mottled

with dusky grayish brown. _Notes._ The familiar _quack_ of the

barn-yard Duck.

Range.--Northern hemisphere; breeds, in America, from Labrador,

Indiana, Iowa, and California north to Greenland and Alaska; winters

from British Columbia, Kansas, and New Jersey to Central America and

West Indies.

[Illustration: 143.]

=143. Pintail= (_Dafila acuta_). L. [Male], 28; [Female], 22. _Ad._

[Male]. Central tail feathers black, 7.5 long, pointed. _Ad._

[Female]. Tail 3.5,; feathers _sharply pointed_; brownish black, with

buff bars; under wing-coverts _dusky_ and _buff_; back blackish with

_internal_ buff loops. _Notes._ A loud _quack_, less sonorous than

that of the Mallard; a low mellow whistle, and a harsh rolling note.

(Nelson.)

Range.--Northern hemisphere; breeds, in America, from New Brunswick,

Iowa, Illinois, and British Columbia northward; winters from British

Columbia, Illinois, and Virginia, south to Central America and West

Indies.

[Illustration: 133.]

=133. Black Duck= (_Anas obscura_). L. 22. _Ads._ Speculum bluish

purple tipped with _black_; no white in wing; lining of wing white and

_dusky_; crown _without_ paler margins; throat, usually, without

markings; legs "olivaceous brown," bill "greenish black, dusky olive,

or olive-green." _Notes._ A _quack_ resembling that of the Mallard.

Range.--Eastern North America; chiefly east of Mississippi; breeds

locally from New Jersey and Illinois north to Labrador and Hudson Bay;

winters from Maine to West Indies.

=133a. Red-legged Black Duck= (_A. o. rubripes_). Similar to No. 133

but larger; crown edged with buff or gray; throat spotted; legs red;

bill yellow.

Range.--Summer range not definitely known, but breeding specimens have

been taken in northern Labrador, James Bay, and west shore of Hudson

Bay; in winter south to Virginia and Arkansas.

[Illustration: 134.]

_134. Florida Duck_ (_Anas fulvigula_). L. 20. _Ads._ Throat and front

of neck plain buff, usually unmarked; speculum sometimes tipped with

white; belly rusty buff; broadly _streaked_ with black. _Notes._ A

_quack_ similar to that of No. 133.

Range.--Florida to coast of Louisiana; resident.

=134a. Mottled Duck= (_A. f. maculosa_). Similar to No. 134, but

underparts _mottled_ with black, the markings being _rounder_.

Range.--Eastern Texas; breeds (at least) from Corpus Christi north to

Kansas; winters on west Gulf Coast.

[Illustration: 135.]

=135. Gadwall= (_Chaulelasmus streperus_), L. 19.5. Under wing coverts

and axillars _pure white_. _Ad._ [Male]. Wing-coverts chestnut; breast

_ringed_ with white. _Ad._ [Female]. Head and throat as in [Male],

back fuscous and buffy; breast and _sides_ ochraceous thickly spotted

with blackish; speculum ashy gray and white. _Notes._ A _quack_ like

that of the Mallard but shriller and more often repeated.

Range.--Northern hemisphere; in America, breeds in the interior from

Kansas and California north to Manitoba and Assiniboia; winters from

Maryland to Florida, rare in northeastern Atlantic States.

[Illustration: 136.]

=136. Widgeon= (_Mareca penelope_). L. 18.5. _Ad._ [Male]. Head and

neck reddish brown; crown buff; sides with wavy black and white lines.

_Ad._ [Female]. Head and throat _rusty_, finely streaked and barred

with black; breast and sides rusty; speculum blackish. _Notes._ Of

male, a shrill, whistling _whee-you_; of female, a low, purring growl.

(Saunders.)

Range.--Northern hemisphere; breeds in America, only in the Aleutian

Islands; casual in migrations and in winter in California and on

Atlantic coast from North Carolina to Greenland.

[Illustration: 137.]

=137. Baldpate= (_Mareca americana_). L. 19. No rusty on head. _Ad._

[Male]. Under tail-coverts black; streak from eye to nape glossy

green. _Ad._ [Female]. Head and throat _whitish_ finely marked with

black; breast and sides rusty washed with grayish. _Notes._ "A low,

soft whistle." (Elliot.)

Range.--North America; breeds in the interior from Minnesota and

British Columbia north to Alaska; winters from British Columbia and

Virginia south to South America; only a migrant on northeast Atlantic

coast to Labrador.

[Illustration: 139.]

=139. Green-winged Teal= (_Nettion carolinensis_). L. 14.5.

Wing-coverts gray, tipped with buff or white. _Ad._ [Male]. A white

crescent in front of wing; speculum (wing-patch) green bordered by

black tipped with white. _Ad._ [Female]. Wings as in [Male]; throat

and sides of neck white, finely spotted with black; breast and sides

washed with rusty, marked with black. _Notes._ A "peculiar chirping

almost a twittering" as they fly. (Seton.)

Range.--North America; breeds from New Brunswick, Minnesota, and

British Columbia north to Greenland and Alaska; winters from Virginia,

Kansas, and British Columbia south to Central America and West Indies.

[Illustration: 140.]

=140. Blue-winged Teal= (_Querquedula discors_). Wing-coverts blue.

_Ad._ [Male]. Cheek patch white. _Ad._ [Female]. Resembles [Female] of

No. 139, but wing-coverts blue; speculum greenish brown not distinctly

tipped with white. L. 16.

Range.--North America; chiefly east of Rockies; breeds from New

Brunswick, Kansas, southern Illinois and northern Ohio, north to

Alaska, mainly in interior; winters from Virginia and Lower

Mississippi Valley to northern South America, California, and Lower

California.

[Illustration: 141.]

=141. Cinnamon Teal= (_Querquedula cyanoptera_). _Ad._ [Male]. Head

and neck, breast and sides reddish brown. _Ad._ [Female]. Resembles

[Female] of No. 140, but the underparts, _including throat_, are

usually suffused with rusty; the throat often being blackish or

speckled with dusky. _Notes._ A rather thin, nasal _quack_. L. 16.

Range.--Western North America from British Columbia south to South

America, east to Rockies and south Texas; rarely to Florida.

[Illustration: 142.]

=142. Shoveller= (_Spatula clypeata_). L. 20. Bill much broader at tip

than at base. _Ad._ [Male]. Belly chestnut; breast around to back

white. _Ad._ [Female]. Wing-coverts blue; back conspicuously margined

with buff. _Notes._ "Occasionally a few feeble quacks." (Elliot.)

Range.--Northern hemisphere; in America chiefly in interior; breeds

locally from Texas, and regularly from Minnesota and British Columbia

north to Alaska and Barren Grounds; winters from British Columbia,

Illinois, and Maryland south to northern South America.

[Illustration: 144.]

=144. Wood Duck= (_Aix sponsa_). L. 18.5. _Ad._ [Male]. Head crested;

green, blue, and purple with white stripes. _Ad._ [Female]. A white

streak through and behind eye; crown glossy purplish brown; back

olive-brown glossed with greenish. _Notes._ A frightened, plaintive,

_oo-eek_.

Range.--North America; breeds locally from Florida to Labrador and

British Columbia, winters from British Columbia, southern Illinois,

and southern New Jersey, south to southern California and Cuba.

[Illustration: 146.]

=146. Redhead= (_Aythya americana_). L. 19. _Ad._ [Male]. Head and

_upper_ neck entirely bright reddish brown. _Ad._ [Female]. Throat

white; back grayish brown without fine bars; speculum gray.

_Notes._ "A hoarse guttural rolling sound." (Elliot.)

Range.--North America; breeds chiefly in interior from Maine,

Minnesota, and California north to Labrador and British Columbia;

winters from British Columbia and Maryland south to Lower California

and West Indies.

[Illustration: 147.]

=147. Canvas-back= (_Aythya vallisneria_). L. 21. _Ad._ [Male]. Head

and _whole_ neck _dull_ reddish brown. _Ad._ [Female]. Head and neck

_rusty_ grayish brown; back grayish brown, _finely barred with black

and white_. _Notes._ "A harsh guttural croak." (Elliot.)

Range.--North America; breeds only in interior from Minnesota and

Oregon north to Alaska and the Barren Grounds; winters from British

Columbia and Maryland south to southern California, Mexico and West

Indies.

[Illustration: 148.]

=148. American Scaup Duck= (_Aythya marila_). L. [Male], 18.5;

[Female], 17.5. _Ad._ [Male]. Head glossed with greenish; sides

without distinct black bars. Ad. [Female]. Feathers about base of bill

white; breast and back rusty grayish brown; speculum white. _Notes._

"Similar to the guttural sound made by the Canvas-back, Redhead and

other diving Ducks." (Elliot.)

Range.--Northern parts of northern hemisphere; in America, breeds in

the interior rarely from Minnesota, and regularly from North Dakota

northward; winters from Long Island to northern South America.

[Illustration: 149.]

=149. Lesser Scaup Duck= (_Aythya affinis_). L. [Male] 17; [Female],

16.5. _Ad._ [Male]. Head glossed with purplish; sides with distinct

black bars. _Ad._ [Female]. Similar to [Female] of No. 148, but

smaller.

Range.--North America; breeds only in interior from Iowa rarely, North

Dakota commonly, and British Columbia, north to Barren Grounds;

winters from British Columbia and Virginia south to Guatemala and West

Indies.

[Illustration: 150.]

=150. Ring-necked Duck= (_Aythya collaris_). L. 16.5. _Ad._ [Male]. A

chestnut neck-ring; chin _white_; back _black_; speculum _gray_. _Ad._

[Female]. Feathers about sides of base of bill and throat white, back

and breast _rusty_ grayish brown; speculum gray. Resembles [Female] of

No. 146, but is smaller and rustier.

Range.--North America: breeding only in the interior from Minnesota

northward; winters from Maryland and British Columbia south to

Guatemala and West Indies; rare on Atlantic coast north of Maryland.

[Illustration: 151.]

=151. American Golden-eye= (_Clangula clangula americana_). L. 20.

_Ad._ [Male]. Head _greenish_; white patch at base of bill _circular_.

_Ad._ [Female]. Head and throat brown; breast and back gray, a white

throat-ring; belly and speculum white. _Notes._ Rarely a low croak; a

high whistling sound produced by wings in flight.

Range.--North America; breeds from Maine, northern Minnesota, and

Alberta, north to Arctic Regions; winters from southern Alaska, the

Great Lakes and Maine, south to Mexico and Cuba.

[Illustration: 152.]

=152. Barrow Golden-eye= (_Clangula islandica_). L. 20. _Ad._ [Male].

Head _purplish blue_; white patch at base of bill _twice as high as

wide_. _Ad._ [Female]. Resembles [Female] of No. 151. _Notes._ A high

whistling made by wings in flight, probably also a low croaking as in

No. 151.

Range.--Northern North America; breeds from Gulf of St. Lawrence, and

mountains of Colorado north to southern Greenland; winters south to

Virginia, Illinois, and California.

[Illustration: 153.]

=153. Buffle-head= (_Charitonetta albeola_). L. 14.7. _Ad._ [Male].

Head blue, purple, and green; a white band from eye to eye across

nape. _Ad._ [Female]. A whitish patch on either side of head; throat

and upper parts grayish brown; belly and speculum white. _Notes._ A

single guttural note like a small edition of the Canvas-back's roll.

(Elliot.)

Range.--North America; breeds from Maine, Iowa, and British Columbia

northward; winters from southern limit of breeding range to West

Indies and Mexico.

[Illustration: 167.]

=167. Ruddy Duck= (_Erismatura jamaicensis_). L. 15. Tail-feathers

narrow and stiff; bill short (1.5) and broad. _Ad._ [Male]. Cheeks

white, cap black, back reddish brown. _Ad._ [Female]. A whitish streak

through dusky cheeks; back grayish brown with fine buffy bars; belly

silvery whitish. _Yng._ [Male]. Similar, but cheeks all white or

whitish.

Range.--Western hemisphere from northern South America to Hudson Bay;

breeds locally throughout its range, but chiefly northward; winters

from New Jersey, southern Illinois and California southward.

[Illustration: 168.]

=168. Masked Duck= (_Nomonyx dominicus_). L. 14. Tail-feathers long,

(4.5) narrow, stiff and pointed. _Ad._ [Male]. Front of head black;

behind it reddish brown all around; white in wing. _Ad._ [Female]. A

brownish streak through eye: buffy streaks above and below it; back

blackish regularly _barred_ with buff; below washed with rusty.

Range--Tropical America north to Lower Rio Grande; accidental in

Wisconsin, Lake Champlain, and Massachusetts.

[Illustration: 154. Winter]

[Illustration: 154. Summer]

=154. Old-squaw= (_Harelda hyemalis_). L. [Male], 21; [Female], 16;

T. [Male], 8; [Female], 2.5. No colored speculum. _Ad._ [Male].

Central tail-feathers much lengthened; in winter, crown, nape, throat,

and neck all around white. In summer, black, with rusty markings on

back. _Ad._ [Female]. winter. Cheeks, neck all around, and underparts

white; breast and sides of neck dusky. In summer, crown, cheeks and

nape blackish, throat and breast dusky; a whitish patch back of eye.

_Notes._ In spring, a rich, musical _a-leedle-a_, frequently repeated in

deep, reed-like tones. (Nelson.) Also "_o-onc-o-onc-ough-egh-ough-egh_."

(Mackay.)

Range.--Northern hemisphere; breeds from northern Labrador and

Aleutian Islands north to Arctic Ocean; winters south to Virginia,

Upper Mississippi Valley, and California, "rarely to Florida and

Texas."

[Illustration: 155.]

=155. Harlequin Duck= (_Histrionicus histrionicus_). L. 17. _Ad._

[Male]. Back and breast slaty blue; head darker. _Ad._ [Female]. Front

half of cheeks and spot over ears whitish, above blackish brown; below

dusky and whitish. _Notes._ "A confusion of low gabbling and

chattering notes." (Nelson.)

Range.--"Northern North America, breeding from Newfoundland, the

northern Rocky Mountains, and the Sierra Nevadas (latitude 38A deg.),

northward; south in winter to the Middle States and California;

eastern Asia, Iceland." (A.O.U.)

[Illustration: 156.]

=156. Labrador Duck= (_Camptolaimus labradorius_). L. 20. _Ad._

[Male]. Primaries blackish; rest of wing white. _Ad._ [Female]. Ashy

gray: speculum white. _Yng._ [Male]. Like [Female] but throat and ends

of greater wing-coverts white.

Range.--Formerly North Atlantic coast; bred from Labrador northward;

wintered south to New Jersey; believed to be extinct; last records,

Grand Menan, New Brunswick, 1871; Long Island, 1875.

[Illustration: 157.]

=157. Steller Eider= (_Eniconetta stelleri_). L. 18. _Ad._ [Male].

Throat and neck black nearly divided by a white ring; top and sides

of head white, forehead and nape greenish; breast chestnut. _Ad._

[Female]. Above and below black and rusty, speculum purple bordered

with white; tail feathers pointed.

Range.--"Arctic and subarctic coasts of the northern hemisphere,

Aleutian Islands, east to Unalaska and Kadiak; Kenai Peninsula."

(A.O.U.)

[Illustration: 158.]

=158. Spectacled Eider= (_Arctonetta fischeri_). L. 21. _Ad._ [Male].

Front of head plush-like; cushiony pads around eyes; above largely

white; breast slaty black; belly black.

Range.--"Alaskan coast of Bering Sea and north to Point Barrow."

(A.O.U.)

[Illustration: 159.]

=159. Greenland Eider= (_Somateria mollissima borealis_). L. 23.

Feathers on sides of bill reaching to nostrils, bare spaces on either

side of feathers on culmen _pointed_ at base (posteriorly.) _Ad._

[Male]. Crown black with a white wedge. _Ad._ [Female]. Brownish black

above margined with rusty and buff; below dusky finely margined with

buff. _Yng._ [Male]. Similar to [Female] but more buffy. _Notes._

"A sort of cooing sound" in the breeding season. (Elliot.) A raucous,

moaning, _'ha ho, 'ha ho_; female's like that of Mallard. (Brunnich.)

Range.--Northeastern North America; breeds from Labrador to Greenland;

winters south to Massachusetts.

[Illustration: 160.]

=160. American Eider= (_Somateria dresseri_). L. 23. Similar in color

to No. 159, but bare spaces on either side of feathers of culmen

_rounded_ at the base (posteriorly).

Range.--Northeastern North America; breeds from Isle au Haut, Maine,

to Labrador; winters south to New Jersey and Great Lakes.

[Illustration: 161.]

=161. Pacific Eider= (_Somateria v-nigra_). Similar to No. 159, but

_Ad._ [Male] with a black =V= on throat; sides of bill more broadly

feathered, distance from end of feathers to base of bare space on

culmen less than distance from same place to end of bill.

_Notes._ "A low guttural note." (Nelson.)

Range.--North Pacific from Aleutian Islands north to Arctic Ocean east

to Great Slave Lake.

[Illustration: 162.]

=162. King Eider= (_Somateria spectabilis_). L. 23. Feathers at side

of bill _not_ reaching nostril. _Ad._ [Male]. White patch on either

side of rump, crown ashy blue. _Ad._ [Female] in 1 _Yng._ Resembling

same plumages of No. 159 and No. 160.

Range.--Northern hemisphere; breeds from Labrador and St. Michaels,

Alaska north to Greenland and Arctic Ocean; winters south to New

Jersey (rarely Ga.), and Great Lakes; one California record.

[Illustration: 163.]

=163. American Scoter= (_Oidemia americana_). L. 19. Feathers at base

of bill not extending forward on sides or top. _Ad._ [Male]. Wholly

black; bill black, yellow at base. _Ad._ [Female]. Brownish above,

lighter below; no white on wing or on sides of head. _Notes._ A long

musical whistle. (Elliot.)

Range.--Northern North America; breeds from Labrador and Alaskan

shores of Bering Sea northward; winters south to Virginia, Great

Lakes, Colorado, and California.

[Illustration: 166.]

=166. Surf Scoter= (_Oidemia perspicillata_). L. 20. Feathers

extending forward on top of bill. _Ad._ [Male]. Black, nape and crown

white; bill orange, yellow, and white, a round black patch on its

sides. _Ad._ [Female]. Above black, throat and breast paler; belly

whitish; a whitish patch at base of bill. _Yng._ Similar but with

white patches on ears.

Range.--Northern North America; breeds from Newfoundland northward;

winters south to Virginia, Florida, Illinois, and Lower California.

[Illustration: 165.]

=165. White-winged Scoter= (_Oidemia deglandi_). L. 22. A white patch

on wing; feathers extending forward along _sides and top_ of bill

nearly to nostrils. _Ad._ [Male]. Black, a white spot about eye; bill

orange, black at base. _Ad._ [Female]. Dusky brown above; lighter

below. _Yng._ [Male]. Similar but sides and front of head whitish.

Range.--Northern North America; breeds from Labrador and North Dakota

northward; winters south to Virginia, southern Illinois, and Lower

California.

[Illustration: 177.]

=177. Black-bellied Tree Duck= (_Dendrocygna autumnalis_). L. 22.

_Ads._ belly and tail coverts _black_: foreback and breast gray;

greater wing-coverts whitish. _Notes._ A shrill whistle. (Elliot.)

Range.--Tropical America north to southern Texas.

[Illustration: 178.]

=178. Fulvous Tree Duck= (_Dendrocygna fulva_). L. 22. _Ads._ Belly

uniform rusty brown; upper tail coverts white; a black streak on

hindneck; no white in wing. _Notes._ A squealing whistle.

Range.--Tropical America, north in summer to Texas, Louisiana, Nevada

and central California. "Casual in North Carolina and Missouri." (A.

O. U.)

Geese and Swans

=169. Lesser Snow Goose= (_Chen hyperborea_). L. 23-28, _Ads._ White,

head sometimes rusty; primaries black. _Yng._ Head, neck, and above

grayish.

Range.--"Pacific coast to the Mississippi Valley, breeding in Alaska;

south in winter to southern Illinois and southern California; casually

to New England." (A.O.U.)

[Illustration: 169a.]

=169a. Greater Snow Goose= (_C. h. nivalis_). Similar to No. 169, but

larger, L. 30-38.

Range.--Eastern North America; breeds in Arctic regions; winters from

Chesapeake, New Jersey (rarely) south to Cuba; rare on Atlantic coast

north of Maryland.

[Illustration: 170.]

=170. Ross Snow Goose= (_Chen rossii_). L. 21; B. 1.6. Similar in

color to No. 169, but much smaller; bill particularly smaller.

Range.--Arctic America in summer; Pacific coast to southern California

and east to Montana in winter.

[Illustration: 180.]

=180. Whistling Swan= (_Olor columbianus_). L. 55. Nostril nearer to

tip of bill than to eye. _Ads._ White, bill and feet black; a small

yellow spot before the eye. _Yng._ Head and neck brownish, rest of

plumage washed with grayish. _Notes._ _'whoogh_, _'whoogh_, very loud

and shrill. (Nuttall.)

Range.--North America; breeds within Arctic Circle; winters from

British Columbia (?) Lower Mississippi Valley, Chesapeake Bay, south

to Gulf of Mexico; rare on Atlantic Coast north of Virginia.

[Illustration: 180. Bill of.]

[Illustration: 181. Bill of.]

=181. Trumpeter Swan= (_Clor buccinator_). L. 65. Nostril about in

middle of bill. _Ads._ White, bill and feet black; _no_ yellow on

lores. _Yng._ Head and neck brownish; rest of plumage washed with

grayish. _Notes._ Loud and sonorous in tone like those of a French

horn. (Elliot.)

Range.--"Chiefly the Interior of North America, from the Gulf Coast to

the Fur Countries, breeding from Iowa and the Dakotas northward; west

to the Pacific Coast; rare or casual on the Atlantic." (A.O.U.)

Geese

[Illustration: 169.1]

=169.1. Blue Goose= (_Chen cA|rulescens_). L. 28. _Ads._ Head and neck

white; below brownish gray; foreback like breast; rump gray. _Yng._

Similar but head and neck grayish brown.

Range.--North America; breeds in Hudson Bay region; winters on west

coast of the Gulf of Mexico; two California records; said to have

occurred in New Jersey.

[Illustration: 171a.]

=171a. American White-fronted Goose= (_Anser albifrons gambeli_). L.

28. _Ads._ Forehead and rump white; below spotted with black. _Yng._

Similar but no white on head no black below.

Range.--North America; breeds in Arctic region; winters on Gulf Coast,

California and Mexico; rare on Atlantic coast.

[Illustration: 176.]

Color Key to North American Birds with bibliographical appendix · 第 5 / 34 段