Tips for using Browse:

Browsing is a valuable way to learn about birds, however it is a brute force approach and not designed for identification. A more sophisticated approach to finding a bird with specific field marks is to use the Step by Step Search. You can also try the Wizard to find a bird, which uses a question and answer approach, but again it does not give you the flexibility of the Step by Step Search.

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Common Sandpiper
Common Sandpiper: Eurasian counterpart to the Spotted Sandpiper; has dusky gray upperparts, heavily streaked breast, and sparkling white underparts. Best distinguished by its habit of standing in a semi-crouch and bobbing back and forth. Flies low over water with stiff shallow wing beats and glides.
Cook's Petrel
Cook's Petrel: This small petrel has a slate-gray back and upperwings marked by a black M-pattern, white underparts, under wings, and face with a small dark eye patch, black bill, blue-gray legs and feet, long slender wings, and a gray tail with black-tipped central feathers and white edges. It feeds mostly on fish and squid. Rapid and erratic flight. Sexes are similar.
Cave Swallow
Cave Swallow: Small swallow (Southwest pelodoma), with steel-blue upperparts, white underparts, rufous wash on breast and sides. Forehead is chestnut-brown and throat and rump are buff. Tail is square. Swift, graceful flight, alternates several rapid, deep wing beats with long curving glides.
Cattle Egret (Palau)
Cattle Egret (Palau): Small, short-necked and stocky egret with white body and pale orange-brown patches on head, neck and back. Sexes are similar. Breeding plumes are slightly shorter on the female. Breeding birds' legs are yellow-green and irises are dark yellow. During peak breeding season, bill, legs and irises turn a bright red. Winter adult and juvenile are white and with dull yellow-orange eyes and bill, legs are green-black. Races separated by the amount and intensity of the orange-brown patches.
Chestnut-winged Cuckoo
Chestnut-winged Cuckoo: Fairly large, long-tailed cuckoo with a long crest. Glossy black-green upperparts with white collar on nape, chestnut wings, buff to orange throat, gray-white underparts, and black vent. Fairly long wings. Long tail with white to buff edges on feathers. Sexes similar. Juveniles have grayer plumage with pale scaling on the wings.
Chestnut-cheeked Starling
Chestnut-cheeked Starling: Small starling with buff-white head, chestnut on cheeks and throat, black-purple back, buff-white rump, long, black-green and white wings, gray breast and flanks, and white belly. Short, forked tail. Female and juvenile pale, gray-brown with black flight feathers and bill, and white shoulder, belly, and vent.
Chinese Pond-Heron
Chinese Pond-Heron: Small, stocky white heron with red-brown head and neck, chestnut breast, slate-gray back, yellow-white around eye, and white chin and line down front of neck. Short, rounded tail. Non-breeding adults have more black on bill, no red-brown or chestnut in plumage, brown-gray back, and brown-gray streaks on crown, face, and breast.
Central American Pygmy-Owl
Central American Pygmy-Owl: Very small owl, red-brown upperparts, brown-gray on head. Red-brown on sides of breast, red-brown streaks on white underparts. Mottled gray and white facial disk, short white eyebrows, no ear tufts. Eyes yellow, bill yellow-buff. Short, rounded wings, black-gray tail with three white bars.
Colima Pygmy-Owl
Colima (Least) Pygmy-Owl: Very small owl, brown upperparts. Brown on sides of breast, brown streaks on white underparts. Mottled tan facial disk, short white eyebrows, no ear tufts. Eyes yellow, bill yellow-buff. Short, rounded wings, black-gray tail with buff barring.
Crested Owl
Crested Owl: Medium to large owl, fine mottling on brown upperparts and on tan-brown or gray-brown underparts. Red-brown facial disk, very long white ear tufts. Eyes and bill are yellow. Long, broad, rounded wings, plain tail.
Common Tern (Palau)
Common Tern (Palau): Medium-sized tern with medium gray upperparts, pale gray underparts sometimes with some pink early in breeding season; glossy black cap and nape. Wings are dark-tipped and have dark leading edge on fore wing. Red bill is black-tipped. Legs are red and tail is deeply forked and elongated, tail reaches wingtips at rest. Sexes are similar. Winter adult and juveniles have white forehead, black crown with white streaks; prominent dark bar on lesser coverts; underparts gray; black bill with red base; legs duller red to black-red.
Common Eider
Common Eider: Large diving duck (v-nigrum), with distinctive sloping forehead, black body, white breast and back. Crown is black and nape is pale green. Wings are white with black primary and secondary feathers. Tail and rump are black. Bill is dull yellow to gray-green (eastern) or orange-yellow (western).
Chinese Egret
Chinese Egret: Population is seriously declining due to competition for living space with humans and other egrets. White overall with shaggy crest, blue-green lores, orange-yellow bill, and black legs with yellow feet. Has been seen feeding on mudflats and tidal flats with other egrets and herons.
Common House-Martin
Common House-Martin: Small swallow, metallic dark blue mantle and crown; wings and tail are black-gray. Forked tail. Solid white rump distinguishes it from other swallows. Legs covered in white down. Flight is graceful, swift and direct on rapidly beating wings. It soars on wide triangular wings.
Common Murre
Common Murre: Medium seabird with brown-black upperparts, throat, white underparts, and long dark bill. Tail is short. Some Atlantic birds have a narrow white eye-ring and stripe extending past the eye. Can dive to depths of more than 240 feet. Feeds on fish and invertebrates. AKA Common Guillemot.
Craveri's Murrelet
Craveri's Murrelet: Small, plump seabird, reminiscent of a small, flying penguin. with black upperparts that extend as a bar onto the side of upper breast, distinct white crescents above and below eyes, white underparts, and dark gray underwing linings. Feeds on crustaceans and small fish.
Crested Caracara
Crested Caracara: Large, ground-dwelling falcon, black body, finely barred tail, wing panels and upper breast. Head crest is black, facial skin is red, and large bill is blue-gray and hooked. Legs are long and yellow. Strong steady wing beats alternated with long to short glides. Soars on thermals.
Cattle Egret
Cattle Egret: Small, stocky egret with a white body and pale orange-brown patches on the head, neck and back. The eyes, bill and legs are orange. This is the only white egret with both a yellow bill and yellow legs. It feeds primarily on insects. It has a direct flight on quick steady wing beats. The sexes are similar.
California Gull
California Gull: This is a medium-sized gull with a white head and underparts, gray wings and black wing tips. The bill and legs are yellow, and it has a red eyering. It has a strong direct flight with deep wing beats. It feeds on worms, mice, other birds and their eggs, and garbage. The sexes are similar, but the males are usually larger than females, with a larger bill, head and tarsi.
Common Loon
Common Loon: Large loon, white-spotted, black upperparts and white underparts. Head, neck are green-black with white-streaked neckbands. Bill is black and thick. Eyes are red-brown. Dives for small fish and crustaceans. Direct flight on strong deep wing beats, head, neck and feet extend beyond body.
Common Goldeneye
Common Goldeneye: Medium diving duck, white-striped black upperparts, white underparts. Head is iridescent green-black with white circular patch between yellow eyes and dark gray bill. Wings are dark with large white patches conspicuous in flight. Legs and feet are yellow. Swift, direct flight.
Cerulean Warbler
Cerulean Warbler: The male is sky-blue with faintly streaked upperparts and black-streaked white flanks. A black band separates a white throat and belly. Wings have two bold white bars. The female has unstreaked blue-gray upperparts and a yellow wash on face and breast with pale streaks on flanks, and yellow eyebrows. The immature bird is paler and more olive over all. Prefers to stay high in the crowns of mature deciduous trees, making it difficult to see.
Chestnut-sided Warbler
Chestnut-sided Warbler: Medium warbler with black-streaked upperparts, white underparts, and chestnut-brown flanks. The cap is bright yellow and moustache stripe is black. Often cocks its tail high above its back as it feeds. The only North American warbler with pure white underparts in all seasons.
Caspian Tern
Caspian Tern: This large stocky tern has pale gray upperparts and white underparts. The cap is black and may appear weakly crested. The large bill is coral-red, the undersides of the primaries are gray, a short white tail is slightly forked, and the legs are black. The flight is strong, swift and graceful. It hovers above water before diving and mainly feeds on fish. The sexes are similar.
Common Tern
Common Tern: This medium-sized tern has medium gray upperparts, pale gray underparts and a glossy black cap and nape. The wings are dark-tipped with a dark leading edge on the forewing. The red bill is black-tipped, legs are red, and the tail is deeply forked and elongated. It has a direct flight, hovering above water before diving for prey. Feeds mainly on small marine fish. Sexes are similar.
Common Merganser
Common Merganser: Large, sleek diving duck with black upperparts and white underparts. Head and upper neck are green-black with head crest usually not visible. Long, thin bill is bright red. Wings are black with extensive white patches. Feeds on fish, mollusks, crustaceans, insects and plants.