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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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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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Cactus Wren: Large wren with black-and-white streaked reddish-brown back, dark crown with distinctive white stripe over eyes, white chin, and heavily spotted white underparts with buff wash on sides and belly. Wings and tail are dark with white bars. Bill is long and slightly decurved.
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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 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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Corn Crake: Medium rail, buff-yellow overall with brown-barred flanks, conspicuous chestnut wing patch, gray head and neck with dark crown, yellow bill. Eats worms, insects, snails, slugs, sometimes seeds and grains. Weak flight with legs dangling, drops back into vegetation after a short distance.
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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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Cackling Goose: Formerly included in the Canada Goose family, this species is smaller with a rounder head and shorter neck and bill. There are four subspecies, we show the hutchinsii that has darker upperparts and a white neck ring. Winters from the southern Great Plains to the western Gulf Coast.
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Common Sandpiper: Eurasian counterpart to the Spotted Sandpiper; has dusky gray upperparts, heavily streaked breast, and sparkling white underparts. Best distinguished by its habit of standing in a semi-crouch and bobbing back and forth. Flies low over water with stiff shallow wing beats and glides.
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Common Redshank: Large sandpiper, scaled black and brown upperparts, dark-streaked neck and breast, white eye-ring broken in front, pale belly and sides with dark chevrons. Dark wings with white trailing edges visible in flight. Legs are orange-red. Short bill is red with black tip.
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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 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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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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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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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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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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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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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 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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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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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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