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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 Nighthawk: Medium nightjar with white-speckled, dark upperparts, black-and-white barred underparts, mottled breast, white throat. Wings are long, dark gray with white bars, nearly covering tail when folded. Gray-brown legs and feet. Darting erratic flight with frequent changes of direction.
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Cinnamon Teal: Small dabbling duck, scaled, dark brown upperparts, cinnaon-brown underparts, head, neck. Eyes are red and bill is relatively long and dark. Green speculum, pale blue shoulder patch on wing are separated by white line. Yellow-gray legs. Swift direct flight with rapid 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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Common Moorhen: Medium, chicken-like marsh bird with gray-brown back and slate-gray head, neck, breast, and belly. Upper flanks show distinct white line. Yellow-tipped red bill is short with red frontal plate extending onto forehead. Tail is white below. Long legs and unwebbed feet are yellow-green.
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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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Clapper Rail: Large, noisy marsh bird, gray or brown upperparts, vertical white-barred flanks and belly, buff or rust-brown breast. Bill is long, slightly decurved. Gray legs, feet. Feeds at low tide on mudflats or hidden in salt marsh vegetation. Flight is low and fluttering over short distances.
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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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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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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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Common Ground-Dove: Small, rounded dove with plain gray-brown back and scaled pink-gray head and breast. Eyes are red and bill is orange-red with black tip. The wings show rufous primaries in flight. Tail is short. Legs and feet are pink. Forages on ground. Swift direct flight with rapid wing beats.
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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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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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Curlew Sandpiper: Medium-sized sandpiper with mottled rufous, white, and black upperparts. Head, neck and breast are a rich rufous while vent, undertail coverts and underwings are white. Black bill is long and slightly decurved. The legs and feet are black. Swift direct flight with rapid wing beats.
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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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Crissal Thrasher: Large thrasher with gray-brown upperparts and unstreaked, gray underparts. The throat is white with dark moustache stripe, eyes are yellow, and black bill is long and strongly decurved. Tail is very long with chestnut-brown undertail coverts. Legs and feet are black.
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California Gnatcatcher: Medium-sized gnatcatcher with a black cap, dark blue-gray upperparts, black tail, and paler gray, buff-washed underparts. Bill is short, slender, and black. Tail is black with white edges, with undertail appearing all-black when closed. Legs and feet are black.
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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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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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Canada Goose: Large, long-necked goose with dark upperparts and paler underparts grading to white on vent. The head and neck are black with white chin bar. Body is usually gray-brown, although varies from dark brown to gray in different races. White semi-circle above black tail is visible in 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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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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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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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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Canvasback: Large, flashy diving duck with pale gray body and black breast, tail. Head is red-brown with long, sloping profile and long, dark bill. Eye is red. Legs and feet are gray. Feeds primarily on aquatic plants. Rapid direct flight with strong wing beats. Flies high, usually in V formations.
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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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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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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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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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Cliff Swallow: Small, stocky swallow, dark blue-gray upperparts, pale orange-brown rump, buff underparts. Forehead is white or buff while throat, sides of face are orange-brown. Crown is blue-black, bill is short and black. Tail is dark and squared. Legs and feet are gray. Catches insects in flight.
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Cassin's Auklet: Small seabird with slate-gray upperparts, pale gray underparts, white belly. Pale yellow eyes with a white crescent patch above them. Short black bill has white spot at base of lower mandible that is visible at close range. Short tail and rounded wings. Rapid direct flight.
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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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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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Costa's Hummingbird: Medium hummingbird with green back, pale gray underparts and dull green flanks. Crown and throat patch are brilliant metallic purple. Straight black bill. Tail is green with black outer tail feathers. Legs and feet are black. Feeds on nectar, spiders, sap and insects. Direct and hovering flight with very rapid wing beats.
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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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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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Common Yellowthroat: Small, skulking warbler with olive-yellow upperparts, bright yellow throat and breast, and pale gray belly. The head has a black mask with a thick white border above, black bill. Legs are pink. Slow weak flight, alternates periods of rapid wing beats with wings pulled to sides.
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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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