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Common Rosefinch: Small, stocky finch, red upperparts and breast, faintly streaked brown back, white underparts. Bill is dark gray and stout. Wings and tail are dark brown. Legs and feet are gray-brown. Forages on ground and in trees and shrubs for seeds and insects. Bounding flight.
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Common Redpoll: Small finch, brown-streaked gray upperparts, bright rose-pink breast, boldly streaked flanks and undertail coverts. Red cap and black chin. Bill is olive-brown with fine black tip. Wings are dark with two narrow white bars; tail is black and notched. Black legs, feet.
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Carolina Chickadee: Small chickadee with gray upperparts, distinct black cap and bib, dull white cheeks, and white underparts with rust-brown flanks. Short, black bill. When disturbed in its nest during incubation, it will hiss and strike intruders, similar to how a snake would act.
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Cuban Pewee: Small flycatcher, gray upperparts, dark gray head with bushy crest and white crescent behind eye, and pale yellow underparts. Wings are dark with two faint bars. Upper mandible is black while lower mandible is yellow. Legs and feet are black. Feeds mostly on small insects.
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Cordilleran Flycatcher: Small flycatcher with olive-brown upperparts, yellow throat and belly separated by olive-gray breast, elongated white eye-ring, and pale wing-bars. Black bill is long and wide, and lower mandible is bright yellow. Weak fluttering flight with shallow wing beats.
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Couch's Kingbird: Large flycatcher, olive-green upperparts, gray head, dark eye patch, white throat, bright yellow underparts. Wings and slightly forked tail are dark. Black legs and feet. Difficult to distinguish from Tropical Kingbird. Slow fluttering flight on shallow wing beats.
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Cassin's Vireo: Small vireo, olive-gray upperparts, white underparts, pale yellow flanks. Head is gray with white eye-ring that extends to brow. Wings are dark with two white bars. Until the 1990s was classified as the Solitary Vireo, along with the Blue-headed and Plumbeous Vireos.
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Canyon Towhee: Large sparrow, gray upperparts, pale gray underparts, large central breast spot, and white belly patch. Crown is rust-brown. Tail is long with brown undertail coverts. Legs are pink-brown. Short flights with rapidly beating wing strokes alternating with wings pulled briefly to sides.
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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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Crimson-collared Grosbeak: Large finch with blood-red body, brown-red back, black hood, bib, huge conical bill, and dark wings. Forages in brushy woodland. Feeds on insects, larvae, seeds, fruits, berries. Short flights, alternates rapid wing beats with wings pulled briefly to sides.
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Carolina Wren: Medium-sized wren with rufous upperparts and buff underparts. Eyebrows are white, wings and tail are dark barred with white flecks. Throat and chin are white. Bill is decurved. Legs and feet are pink-gray. Range expands north when winters are mild and retracts south when harsh.
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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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Common Crane: Large wading bird, gray overall with a black face, chin, throat and neck; shows a patch of bare red skin on crown. Broad white stripe extends from behind eye down back of neck. Black flight feathers and short tail are visible in flight. Bill is dull yellow and legs and feet are black.
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Cinnamon Hummingbird: Medium size, bicolored hummingbird with bronze green upperparts and cinnamon colored underparts. The tail is square, rufous with gold-green edging. This promiscuous bird attracts a female by flying back and forth like a swing. Both sexes are protective of feeding territories.
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Common Cuckoo: Large cuckoo, gray upperparts, paler underparts with dark bars on belly. Dark gray wings; tail is dark gray with spotting on outer edges near base. Feeds on caterpillars, insects and larvae. Wings are held low in flight, depressed far below body at bottom of downstroke.
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Common Pauraque: Medium nightjar with dark-streaked, mottled gray upperparts, white throat, black chin, rufous face, pale gray-brown underparts. Wings have brown and black bars, white band at base of primaries visible in flight. The gray tail is long, with dark edges and white patches.
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Common Greenshank: Large sandpiper with scaled gray-brown upperparts, white rump, and white underparts, streaked and spotted with brown on flanks and sides. Yellow-green legs. Bill is slightly upturned. Eats small fish, insects and larvae. Swift direct flight with clipped wing beats.
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Cedar Waxwing: Small waxwing, red-brown upperparts, pale slate-gray rump, buff underparts. Head is crested, has black mask with narrow white band below. Yellow-tipped tail, white undertail coverts. Wings have red wax-like tips on secondaries from which it gets its name. Black bill, legs and feet.
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California Thrasher: Large, slender thrasher with dark brown upperparts and paler gray-brown underparts. Face is finely streaked, eyes are dark, and black bill is very long and down curved. Throat has small buff patch. Tail is long with reddish-brown undertail coverts. Legs and feet are gray-brown.
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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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Cooper's Hawk: Medium, agile hawk with dark blue-gray back and white underparts with many fine rufous bars. Cap is darker than upperparts. Eyes are red. The tail is long with thick black-and-white bands. Legs and feet are yellow. Alternates rapid wing beats and short glides, often soars on thermals.
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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 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 Raven: Large raven with all-black body, large, stout bill, wedge-shaped tail. Eats invertebrates, vertebrates, insects, carrion, refuse, eggs and young of other birds, and rodents. Strong flight, alternates several deep wing beats with long glides on flat wings. Soars on thermals, updrafts.
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Chestnut-backed Chickadee: Small, energetic chickadee with chestnut-brown back, rump and flanks, and white breast and belly. Cap and throat are black; cheek patch is white. Wings and tail are dark. Legs and feet are gray-black. Song not whistled like other chickadees, more like a sparrow chipping.
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California Towhee: Large sparrow, uniform brown-gray body, faintly streaked underparts, buff throat bordered with dark streaks. Tail is long with cinnamon-brown undertail coverts. Pink-brown legs and feet. Short flights with rapid beating wing strokes alternating with wings pulled briefly to sides.
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California Quail: Medium quail with distinctive, curled black head plume and white-bordered black throat. Breast is gray and belly is sharply scaled. The flanks are brown with white streaks and back is olive-brown. Legs and feet are gray. Alternates several stiff, rapid wing beats with short glides.
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Clark's Nutcracker: Medium, noisy and inquisitive jay with pale gray head and body. Black bill is long and stout. Wings are black with white patches and tail is black with white edges. Feeds on nuts, insects, eggs and young of other birds, lizards, carrion and small mammals. Steady deep wing beats.
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Common Poorwill: Small, stocky nightjar with pale brown mottled body and white collar separating black throat from narrowly barred underparts. Wings are rounded and tail is short and fan-shaped with outer tail feathers tipped white. Pink-brown legs and feet. Silent flight on quick shallow wing beats.
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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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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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California Condor: Very large raptor with black body, bare-skinned red-orange head, and white wing patches. They can soar for longs periods with minimal wing movement. Locates carrion with its keen eyesight, can survive several days without food. Has the largest wingspan of any North American bird.
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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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Cape May Warbler: Small warbler, olive-yellow upperparts, thick, black streaks on yellow underparts. Bright yellow face, chestnut-brown ear patch, black crown. Wings are dark with large white patches. First collected in Cape May, New Jersey in 1811 and not seen again in that area for over 100 years.
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Chimney Swift: Medium-sized swift, uniformly dark brown with slightly paler throat and upper breast. Inconspicuous spines extend past web at tips of tail feathers. Bill, legs and feet are black. Flight is rapid and batlike on swept-back wings, alternates with gliding. Soars on thermals and updrafts.
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Chipping Sparrow: Medium, slender sparrow with black-streaked brown back and pale gray underparts. Cap is rufous, nape is gray, throat is white, and face stripes are black-and-white. Black bill. Pink-orange legs and feet. 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. Legs are bright pink-red. 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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Cassin's Kingbird: Large flycatcher, dark olive-gray upperparts, dull yellow underparts. Mask is dark gray, throat is white and breast is gray. Tail is black with gray or white tip. Black bill, legs and feet. Bouyant fluttering flight with shallow wing beats. Hovers to take insects, berries, fruit.
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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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Canada Warbler: Small warbler with slate-gray upperparts, bright yellow underparts, black-streaked necklace, and white vent. The eye-ring is yellow to white. Bill is gray. Pink legs and feet. Skulks in low, dense undergrowth beneath mixed hardwoods. Direct flight with quick, fluttering wing beats.
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Cassin's Finch: Medium-sized, cheery finch with bright red crown, brown-streaked back. White belly, buff neck,upper breast and rump. Bill tapers evenly to a sharp point. Forages on ground and high in trees, eats mostly conifer seeds and buds, some insects. Swift bounding flight on rapid wing beats.
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