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Bridled Titmouse: Small titmouse, gray upperparts, black-bordered gray crest, white face, black bib, eyestripe, ear patch border, pale gray underparts. Gray wings, tail. Weak flight with shallow wing beats. Flies short distances with several quick wing beats, then pulls wings to sides.
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Brown-headed Nuthatch: Medium nuthatch, gray upperparts, brown cap, small, white nape patch, dark eye-line, white face, buff underparts. Wings and tail are gray. Legs and feet are black. Weak fluttering flight of short duration, alternates rapid wing beats with wings drawn to sides.
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Bahama Woodstar: Medium hummingbird, iridescent green upperparts, violet-pink throat, partial white collar, and mixed buff- and olive-green underparts; may have pink-tinged forehead. Forked tail is black with orange-brown center. Bill is slightly decurved. Direct and hovering flight.
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Berylline Hummingbird: Medium hummingbird, glittering green back, head, nape, throat, and breast. Wings and tail are rufous. Bill is black; lower mandible has red base. Undertail coverts are cinnamon-brown. Feeds on nectar and insects. Direct and hovering flight with rapid wing beats.
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Bachman's Warbler: Small warbler, olive-green upperparts, yellow forehead, throat, underparts, faint white eye-ring, black crown, bib. It was last seen in the United States in 1962, when it was recorded near Charlestown, South Carolina. In Cuba a wintering female was spotted in 1981.
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Black-capped Vireo: Small vireo, olive-green upperparts, black hood, white spectacles interrupted with black above the eye, white underparts with olive-yellow flanks. Wings are dark with two pale bars. Iris is red-brown to red. It has been listed as an endangered species since 1987.
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Bell's Vireo: Small vireo, faint, broken eye-ring, thick, slightly flattened hooked bill, one or two faint wing bars. Upperparts are gray and underparts are white with pale yellow wash on sides. Eastern race has gray-green upperparts and distinct yellow wash on underparts. Legs and feet are gray.
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Black-capped Gnatcatcher: Very small. Black cap, blue-gray upperparts, black tail, gray white underparts. Long slender black beak. The outer tail feathers mostly white gives underside of tail a white appearance when tail closed. Weak fluttering direct flight with shallow wing beats.
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Black-tailed Gnatcatcher: Medium gnatcatcher with black cap, blue-gray upperparts, black tail, and pale gray underparts. The bill is short and black. Black tail is edged with white; underside of tail appears mostly black with large white spots near tip when closed. Black legs and feet.
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Bumblebee Hummingbird: One of the smallest hummingbirds at 2.75 inches with green upperparts, sides, and white underparts. The gorget is violet-red and the rounded tail is green with a rufous base. This bird can hover in a horizontal positon with it's tail cocked vertical as it feeds on nectar.
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Black-faced Grassquit: Small sparrow, very dark olive-gray with black head and breast. Black bill, legs and feet. Very common in the West Indies. Feeds mainly on seeds, especially of grasses and weeds. The flight is weak, bouncy and fluttering. Alternates rapid wing beats with pulling wings to body.
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Buff-bellied Hummingbird: Medium-sized hummingbird with iridescent green upperparts, head, throat, and upper breast, and buff lower breast and belly. Slightly forked tail is dark chestnut-brown with cinnamon-brown undertail coverts. Bill is slightly decurved and red with a black tip.
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Bananaquit: Small and short-tailed with short, decurved black bill. Black above with white underparts. Belly washed with yellow with bold white stripe over eyes. Rump is yellow. Legs and feet are black. Weak fluttering flight, alternates rapid wing beats with brief periods of wings pulled to sides.
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Black-chinned Hummingbird: Medium hummingbird with metallic green upperparts, gray underparts, white breast, green-washed flanks. Head appears black overall with white spot behind eye; cap is very dark green. Throat is iridescent violet; bill is long and slightly decurved. Forked tail is dark green with black outer tail feathers.
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Broad-tailed Hummingbird: Medium hummingbird with green upperparts and flanks, iridescent red throat, and gray underparts. Dark green tail may show some rufous. Black bill is long and straight. Black legs, feet. Feeds on nectar, spiders, sap and insects. Direct and hovering flight with very rapid wing beats.
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Broad-billed Hummingbird: Medium-sized hummingbird with metallic green body and vibrant blue throat. Bill is bright red with black tip. Tail is black, forked, and has white undertail coverts. Legs and feet are black.Feeds on nectar and insects. Direct and hovering flight with very rapid wing beats.
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Bushtit: Tiny, acrobatic bird with gray-brown upperparts and paler underparts. Eyes are dark brown, bill is tiny, and tail is long. Pacific coast race has brown crown. Rocky Mountain race has gray cap and brown ear patch. South New Mexico/Texas race has black mask, ear patch. Weak fluttering flight.
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Blue-gray Gnatcatcher: Small, flycatcher-like perching bird, blue-gray upperparts, white underparts, prominent white eye-ring. Wings are dark. Black tail is long and white-edged. Forages in thickets, trees and shrubs for insects, their eggs and larvae. Weak fluttering flight on shallow wing beats.
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Blue-winged Warbler: Medium-sized warbler with olive-green upperparts and yellow underparts. The head is yellow with thin black eye line and olive-green nape. Wings are dark gray with two white bars. When its range overlaps with the Golden-winged Warrbler, it often interbreeds with or displaces it.
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Bank Swallow: Small swallow with brown upperparts, and a brown breast band seperating white underparts from white throat and chin. Tail is notched. Brown legs, feet. The smallest North American swallow. Swift, erratic flight, alternating several shallow, rapid wing beats with short to long glides.
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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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