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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 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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Clay-colored Robin: Large thrush with olive-brown upperparts, buff throat has faint brown streaks, and pale brown underparts. Bill is yellow-green and black-tipped. The legs and feet are gray-black. Direct, swift flight on rapidly beating wings. It is the national bird of Costa Rica.
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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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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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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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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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