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Burrowing Owl: Small ground-dwelling owl, mostly brown with numerous white spots and no ear tufts. Eyes are yellow. White chin and throat. Tail is short, and legs are long. Bouyant, erratic flight with slow, silent wingbeats. May hover briefly above prey. The scientific name means "little digger."
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Black-headed Grosbeak: Large, stocky finch, black-streaked, orange-brown back, black head, wings, tail. Breast is orange-brown and belly is yellow. Wings have conspicuous white patches. Black legs, feet. Female lacks black head and throat, has brown streaked upperparts and buff streaked underparts. Forages on ground and in trees and bushes. Eats insects, caterpillars, seeds, fruits and berries.
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Brewer's Blackbird: Medium-sized blackbird with purple gloss on head and neck and green gloss on body and wings. Eyes are yellow. Follows farm tractors and plows. Forages on ground. Feeds on caterpillars, insects, fruits, seeds and grains. Strong, swift and direct flight with rapidly beating wings.
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Bewick's Wren: Small wren with unstreaked, gray to red-brown upperparts and plain white underparts. White eyebrows are conspicuous. Tail is long and white-edged with dark bars. Bill is long and slightly decurved. Legs and feet are gray. Eastern populations are red-brown, Northwestern birds are more brown, and Western Interior birds are gray-brown. Eastern populations have seriously declined since the 1960s.
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Bullock's Oriole: Medium oriole, mostly bright orange with black crown, eye-line, throat stripe, back, and central tail. Wings are black with large white patches. Forages in trees and bushes. Feeds on insects, caterpillars, fruits and berries. Sips nectar. Strong direct flight with rapid wing beats.
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Baird's Sparrow: Small sparrow with pale-streaked, rich dark brown upperparts, white underparts, and dark streaks on upper breast and flanks. Orange-brown crown is marked with fine dark lines. Legs and feet are pink-brown. Short low flights, alternates rapid wing beats with wings pulled to sides.
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Black-necked Stilt: Large shorebird with sharply contrasting black upperparts and white underparts. Long, thin, upcurved bill. Red eyes with white eye-rings, and white patch above. Legs are extremely long and red-pink. Feeds on insects, fish, worms, small crustaceans and seeds. Swift direct flight.
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Black-throated Gray Warbler: Small warbler, black-marked, slate-gray upperparts, black streaks on flanks, white underparts. Head has black hood and throat, sharply contrasting white eyebrow and cheek stripe, and yellow spot in front of eye. Wings are dark with two white bars. Black bill, legs, feet.
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Barrow's Goldeneye: Medium diving duck with black upperparts, contrasting white shoulder bars, white underparts. Head is large, glossy, and purple-black with golden yellow eyes and a crescent-shaped white patch behind a dark bill. White wing patches are visible in flight. Yellow legs and feet.
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Buff-breasted Sandpiper: This medium-sized sandpiper has a buff wash over the entire body except for the white vent. It has black-spotted and streaked upperparts, slightly scaled underparts, a white eye ring, black bill and yellow legs. It feeds mostly on insects. It has a swift direct flight with rapid wing beats. It shows white wing linings in flight. The sexes are similar.
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Baird's Sandpiper: This medium-sized bird has scaled gray-brown upperparts, white underparts and a dark-spotted gray-brown breast. The crown, face and neck are buff with fine brown streaks. It has a white rump with a dark central stripe and black legs and feet. Feeds on insects and spiders. Swift direct flight with rapid wing beats; long wings allow them to make long flights. Sexes are similar.
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Black Rail: Smallest North American rail, mostly dark gray or nearly black with white-speckled back, belly, flanks. Nape and upper back are chestnut-brown. Eyes are red. Eats seeds of aquatic plants, grasses and grains, insects and small marine crustaceans. Weak fluttering flight with legs dangling.
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Bachman's Sparrow: Medium-sized sparrow with brown-streaked gray upperparts and buff underparts except for white belly. Face is gray with brown crown and a thin, dark line extending back from eye. The tail is long, dark, and round-tipped. Upper mandible is dark. Legs and feet are pink.
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Bohemian Waxwing: Large waxwing with gray upperparts, pink-gray crest, black mask and chin, and gray underparts. The wings are black with a sharp yellow or white line and red spots on secondaries (visible when folded). Tail is dark and yellow-tipped with cinnamon-brown undertail coverts.
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Boreal Chickadee: Large chickadee, brown upperparts, dark brown cap, small black bib, gray face and neck, white cheek, rufous sides, white underparts. Gray wings, tail. Short, weak flights on rapidly beating wings. Alternates several quick, shallow strokes with wings pulled to sides.
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Black-capped Petrel: Large petrel with white underparts, dark brown to black back and upper wings, black cap, and white collar (this field mark is missing in some birds). Tail is long, dark, and wedge-shaped; underwings show broad dark margins. Hooked bill is dark, legs are pink. High arcing flight.
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Bridled Tern: Medium pelagic tern. Black crown, nape separated from gray-brown upperparts by whitish collar. Chevron-shaped white forehead patch extends behind eye. Long pointed wings and deeply forked tail. Whitish underparts; underwings have brown trailing edge. Black bill, legs.
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Black-bellied Whistling-Duck: Large, colorful duck with bright red bill, pink-red legs and feet. Shows white wing patch, black belly, reddish-brown breast, neck and back. Face, foreneck are gray, white eye ring. Feeds on aquatic plants, cultivated grains, seeds. Direct flight on rapid wing beats.
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Band-rumped Storm-Petrel: This is a black-brown storm-petrel with gray-brown wing bars and a conspicuous white band across the rump and large, slightly notched tail. It has a black bill, legs and feet. It has a buoyant, zigzag flight, alternating several rapid wing beats. It feeds on invertebrates, small vertebrates and sometimes carrion from the water's surface. The sexes are similar.
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