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Canvasback: This is a large, flashy diving duck with a pale gray body, black breast and tail and gray legs and feet. The head is red-brown with a long sloping profile, a long dark bill and red eyes. It feeds primarily on aquatic plants. It has a rapid direct flight with strong wing beats and flies high, usually in V- formations.
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Calliope Hummingbird: Very small hummingbird, metallic green upperparts and flanks, white underparts. Throat feathers are long, purple-red, appearing as streaks on a white background, whiskers when fluffed out, or dark, inverted V when folded. Direct and hovering flight with very rapid wing beats.
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Chestnut-collared Longspur: Small, sparrow-like bird with brown-streaked upperparts, black breast and flanks, some have chestnut on underparts, pale gray belly. Face is buff with black stripe behind eye. Nape is chestnut-brown, crown is black, and throat is white. Tail is black with strongly contrasting white outer tail feathers.
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Clark's Grebe: Large grebe, gray-black upperparts, white underparts, and slender neck with white on front and black on back. White face, black cap extends nearly to red eyes. Bill is yellow-orange. Until the 1980's thought to be a pale morph of the Western Grebe. Direct flight on rapid wing beats.
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Clay-colored Sparrow: Medium sparrow with black-streaked brown upperparts and buff underparts. The face is pale with finely streaked crown, crisp brown cheek patch, white eyestripe, and gray nape. Pink-gray legs and feet. Short flight, alternates several rapid wing beats with wings pulled to sides.
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Cassin's Sparrow: Medium, skulking grassland sparrow, fine brown streaks on gray-brown head and back, buff underparts. Tail is long, rounded, white-tipped. Legs, feet are pink-orange. Forages by scratching on the ground. Short flight, alternates several rapid wing beats with wings pulled to sides.
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Connecticut Warbler: Large ground-walking warbler, olive-gray upperparts, dull yellow underparts. Head has a slate-gray hood and bold white eye-ring. It was named for the state where it was first discovered, where it is an uncommon migrant. Sometimes called Swamp Warbler.
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Chuck-will's-widow: Large nightjar with entire body complexly mottled with brown, gray, and black. Collar is white, throat is brown, and breast patch is dark brown. The tail is white-edged. Legs and feet are brown. Feeds at night, mostly on insects. Bouyant, silent flight with flicking wing beats.
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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.
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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.
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Common Chaffinch: Medium finch. Buff body. Crown and nape are blue-gray; belly and vent are white. Dark wings with white shoulder patches and single white bars. Forages in trees, bushes. Eats seeds and insects. Bounding flight, alternates rapid wing beats with wings pulled to sides.
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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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Common Ringed Plover: Plump little plover with dark gray-brown upperparts, pure white underparts, and strong black mask and chest band. Base of dark-tipped bill and legs are bright orange. Frequents mudflats. Eats worms, aquatic insects, crustaceans and mollusks. Direct flight with rapid wing beats.
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Cory's Shearwater: Large gray-brown shearwater, white underparts, pale yellow bill. Feeds at night on crustaceans and large sqiud it takes from the surface. Best identified by its relatively slow, languid flight compared to other shearwaters. Wings held downward. Soars on fixed wings if wind is up.
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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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Cackling Goose: This small to medium-sized goose has a mottled gray-brown body, black legs, tail, neck, head and face, with a white chin strap stretching from ear to ear and a white rump band. The bill is small and triangular. It eats a variety of plant species and parts, especially grasses, sedges, grain and berries. Strong deep wing beats. Sexes are similar; the male is larger.
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