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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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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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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.
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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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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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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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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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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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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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Cinnamon Teal: This small duck has scaled dark brown upperparts, cinnamon-brown underparts, head and neck, red eyes, long dark bill and yellow-gray legs. White line divides green speculum and pale blue shoulder patch on wing. Female is brown-scaled overall with dull blue shoulder patch, dark eyes and pale edged upper mandible. Feeds on seeds and insects. Swift direct flight with rapid 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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Curve-billed Thrasher: Medium-sized thrasher (palmeri), with gray upperparts and spotted, pale gray underparts. Eyes are orange-red and bill is long and decurved. Tail is long and dark gray. Legs and feet are black. Feeds on insects, spiders, small reptiles, fruits, seeds and berries.
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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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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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Common Snipe: Longest-billed of all snipes, best identified by broad white stripe at base of underwing. Upperparts cryptically colored with brown and yellow-brown streaks of many different shades. Underparts white but strongly suffused with orange wash, heavily barred and streaked with dark brown.
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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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