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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-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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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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Black Swift: Large, bulky swift, black overall. Wrist (wing angle) is very close to body. Long, slightly forked tail, often fanned out. It is the largest North American swift. Spends most of its time thousands of feet in the air. It flies on stiff, shallow wingbeats. Soars on thermals and updrafts.
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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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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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Blackburnian Warbler: Medium warbler, yellow-orange head, black cap and cheek patch, and orange throat. Upperparts are black with white stripes and underparts are white with black- streaked flanks. Wings have prominent white patches. The tail is black with white on outer tail feathers.
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Black-throated Green Warbler: Medium-sized warbler with olive-green upperparts, black-streaked flanks, and white underparts. Face is yellow with black eyestripe and bill. Crown is olive green. Throat and upper breast are black. Wings are dark with two white bars. Tail is dark. Black legs and feet.
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Black-throated Blue Warbler: Small warbler that is the most strikingly sexually dimorphic of all wood warblers. Male has dark blue upperparts, black throat and mask. White underparts with black sides and white wing patch at base of primaries. Bill, legs and feet are black. The female is olive-brown.
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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 Bunting: Small, stocky brightly colored bunting. The male (shown in background) is deep blue overall with black face and upper breast and a stout, black bill. The female (shown in foreground) is uniformly brown with a gray bill. 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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Bronzed Cowbird: Small blackbird (aeneus), brown-black overall with blue sheen on wings and tail. Eyes are red and bill is dark and heavy. Feeds on insects, seeds and grains. Often follows cattle to eat insects that are kicked up. Swift direct and swooping flight with rapid wing beats.
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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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Bicknell's Thrush: Small thrush, olive-brown upperparts, buff breast with brown spots, white or buff belly. Eye has faint gray ring. Upper mandible black with pale base, lower mandible yellow with black tip. Tail, rump have rust-brown wash. Swift, direct flight with jerky wing strokes.
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Buff-collared Nightjar: Small nightjar, mottled gray-brown upperparts, buff collar that appears lighter on dark throat, pale gray-brown underparts with dark brown bars. Tail is gray-brown with white corners. Legs and feet are black. Flight is silent and bouyant on flicking wing beats.
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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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Black Guillemot Adult: Medium-sized seabird, black body with a large white wing patch and a dark, pointed bill. In flight white auxillaries and underwing linings are visible. Legs and feet are red. It flies low over the water with rapid wing beats. The inside of their mouth is bright orange.
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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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Blyth's Pipit: Buff-brown to Streaked black-brown above; wings are tipped buff with two pale wingbars. Tail is black-brown with rufous tinged central feathers; buff below and orange-buff on flanks, vent and undertail. Upper breast has dark streaking, cream colored supercilium extending behind the eye with thin black moustachial stripe and broad buff submoustachial stripe, narrow black malar stripe. Female is similar and juvenile is paler and has white wingbars and feather tips.
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