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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.
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Cook's Petrel: Small petrel, slate-gray back and upperwings marked by a distinctive black M pattern. Underparts, underwings are white. Face is white with small, dark mask. Wings are long and slender. Tail is gray, black-tipped central feathers and white edges. Black bill, blue-gray legs and feet.
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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.
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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.
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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).
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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.
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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.
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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.
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Cattle Egret: Medium, stocky egret with white body and pale orange-brown patches on head, neck and back. Eyes, bill and legs are orange. This is the only white egret with both a yellow bill and yellow legs. Feeds primarily on insects disturbed by livestock. Direct flight on quick steady wing beats.
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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.
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California Gull: Moderately large gull, white body, gray wings, black wing tips. Bill is yellow with red and black spot near tip of bill on lower mandible. Legs are yellow; eye is dark with red orbital ring. Strong direct flight with deep wing beats. Soars on thermals and updrafts.
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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.
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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.
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Common Tern: Medium tern, medium gray upperparts, pale gray underparts, glossy black cap and nape. Wings are dark-tipped and have dark leading edge on forewing. Red bill is black-tipped. Legs are red and tail is deeply forked and elongated. Direct flight, hovers above water before diving for prey.
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Caspian Tern: Large, stocky tern with pale gray upperparts, white underparts. Cap is black and may appear weakly crested; large bill is coral-red. Undersides of primaries are gray. Tail is white, relatively short, and slightly forked; legs are black. Hovers above water before diving.
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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.
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Cerulean Warbler: Small warbler with sky-blue, faintly streaked upperparts, black-streaked white flanks. Black band separates white throat and belly. Wings have two bold white bars. Black bill, legs and feet. Prefers to stay high in the crowns of mature deciduous trees, making it difficult to see.
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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.
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