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Botteri's Sparrow: Medium-sized sparrow with brown-streaked, gray upperparts and pale gray underparts. Bill is gray. Wings are tinged rust-brown. Tail is gray-brown, long, and round-tipped. Short flights with rapidly beating wing strokes alternating with wings pulled briefly to sides.
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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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Brown Thrasher: Medium thrasher, rufous upperparts, black-streaked, pale brown underparts. Eyes are yellow. Brown-black bill curves down, lower mandible has pale base. Wings have two white and black bars. Tail is long and red-brown. Legs and feet are brown. Fast flight on shallow, rapid wing beats.
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Black-capped Chickadee: Medium-sized, stocky chickadee with pale gray upperparts and breast and pale olive-brown underparts. The black cap and bib and white cheeks are conspicuous. Black bill is short and thin. Wings are dark with broad white edges on feathers. State bird of Maine and Massachusetts.
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Baltimore Oriole: Small oriole, mostly bright orange with black hood and back. Wings are black with orange shoulder patches and strongly white-edged feathers that appear as bars. Black base, center form T-shaped mark on orange tail. Strong swift and direct flight on rapid wing beats.
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Bahama Mockingbird: Medium mockingbird with gray-brown upperparts and dark-streaked, pale gray underparts. Wings are dark with two white bars and white feather edges. Tail is long and white-tipped. Legs and feet are dark gray. Eats insects, spiders, small reptiles, berries and fruits.
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Black-vented Oriole: Large oriole with black hood, upper back, wings, and tail, including vent. Underparts and lower back are bright yellow-orange. Black bill is long and slender. Legs and feet are gray. Forages in trees and bushes. Feeds on insects, berries and fruit. Strong, swift, direct flight.
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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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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-crested Titmouse: Large titmouse with gray upperparts, pale gray underparts, and rust-brown flanks. The head has black cap and crest, pale gray face, and pale eye-ring. Wings and tail are gray. Gray legs and feet. Was once considered a subspecies of the Tufted Titmouse. AKA Mexican Titmouse.
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Brown-capped Rosy-Finch: Medium finch, pink-red overall with black forehead, brown head, breast, back. Black bill in summer, yellow with black tip in winter. Forages on ground, eats seeds, sometimes insects. Swift bouncy flight, alternates rapid wing beats with wings pulled to sides.
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Brambling: Medium-sized finch with jet-black hood extending to upper back with orange shoulder patches, throat, and breast. Underparts are buff with black-spotted flanks. Wings are black with white and orange bars. Bounding flight, rapid wing beats alternating with wings at sides.
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Blue Bunting: Small, stocky bunting with stout, black bill. Male is deep blue overall with black face and upper breast. Forages on ground, in thickets and in brushy understory for seeds, insects and larvae. Short flight, alternates rapid wing beats with wings pulled briefly to sides.
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Bendire's Thrasher: Medium thrasher with olive-brown upperparts, spotted buff underparts. Bill is short, gray and slightly decurved with pale pink lower mandible base. Eyes are yellow-orange. Tail is long, olive-brown above, black with white tips below, and has brown undertail coverts.
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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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Black-backed Woodpecker: Small woodpecker with black back, black wings with white spots on flight feathers, barred flanks, white underparts. Head has a conspicuous white cheek mark and yellow crown. Tail is black with white outer tail feathers. Black bill is long and stout. Legs and feet are gray.
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Black-billed Magpie: Large, noisy jay, mostly black, with very long tail and dark, stout bill. Wings and tail are iridescent blue and green-black. White belly and sides. Eats insects, larvae, carrion. Direct flight on shallow, steady wing beats. Often glides between perches or from perch to ground.
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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. Forages on ground and in trees and bushes. Eats insects, caterpillars, seeds, fruits and berries.
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Brown Jay: Large, crestless jay with dark brown upperparts and paler brown underparts grading toward white under white-tipped tail. Head is darker brown with thick, black bill. Legs and feet are black. Feeds on insects, eggs, vertebrates, seeds, nuts, fruits and berries. Steady and bouyant flight.
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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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Brown-headed Cowbird: Small blackbird with glossy brown head, heavy bill, and dark eyes. The black body has a faint green sheen. Walks on ground to forage and holds tail cocked over back. Feeds on caterpillars, insects, spiders, fruits, grains and seeds. Swift direct flight with rapid wing beats.
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Blue Jay: Medium, noisy jay with bright blue upperparts, pale gray underparts, distinct head crest, and neck surrounded with a curious black necklace. Black-barred wings and tail have prominent white patches. Direct flight with steady and bouyant wing beats. Glides between perches or to the ground.
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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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Black-throated Sparrow: Medium sparrow, gray-brown upperparts, white underparts, black bib. Head has dark gray cap and sharply contrasting white eyebrow and cheek stripe. Bill is black. Long, round-tipped tail is edged with white. Legs and feet are gray. Forages on the ground and in low vegetation.
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Black Rosy-Finch: Medium finch with black-brown breast and back, and gray headband. Belly, rump, and wing patches are pink mixed with brown. Forages on ground and in shrubs, grasses and snowfields. Eats seeds and insects. Swift bounding flight, alternates rapid wing beats with wings pulled to sides.
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Blue Grosbeak: Large finch, bright purple-blue body, black face, and two wide, brown wingbars. Dark wings, tail. Hops on ground to forage. Gleans from bushes, weeds and trees. Feeds on insects, snails, grains, seeds and fruits. Swift flight, alternates rapid wing beats with wings pulled to sides.
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Black-billed Cuckoo: Medium cuckoo with brown upperparts, white underparts. Eye-ring is red and decurved bill is black. Tail is long with faint white, dark-eyed spots underneath. Feeds primarily on caterpillars, also eats insects, small fish, mollusks and fruits. Makes low flights of short duration.
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Black-chinned Sparrow: Medium sparrow, plain, dark gray with brown-streaked back, pale gray belly, black chin and pale eyestripe. Bill is pink. The legs and feet are yellow-gray. Forages in brush and on ground. Short flights on rapidly beating wings alternating with periods of wings pulled to sides.
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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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Brewer's Sparrow: Medium sparrow with finely streaked gray-brown upperparts, pale eye-ring, dark moustache stripe, and plain, pale gray underparts. Bill is pink with dark tip. Legs and feet are gray-pink. Short flights with rapidly beating wing strokes alternating with wings pulled briefly to sides.
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