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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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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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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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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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Black Storm-Petrel: Small seabird, brown-black overall with long, dark wings showing pale bar on upper side, and forked tail. The hooked bill is dark and has a tube on top. Legs and feet are black. Flight is mothlike with deep, steady wing beats. Comes closer to shore than most other storm-petrels.
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Bulwer's Petrel: Medium petrel, dark brown overall, pale diagonal bars across secondary coverts. Long tail is usually held in a point; wedge shape visible when fanned. Bill is black and hooked. Legs and feet are black. Feeds on squid, plankton and small fish. Picks food from surface while in flight.
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Black-vented Shearwater: Medium shearwater, brown-black upperparts, white underparts, brown mottling on sides of breast and flanks. Dark cap extends below eye. Tail is dark. Eats fish, crustaceans, and squid. Quick low flight with short stiff wingbeats followed by glide. Soars in high winds.
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Brown Booby: Large, gull-like seabird, mostly dark brown with white underwing coverts, belly, and vent. Blue-gray bill. Yellow legs and feet. Plunge dives from 30-50 feet. Feeds on parrot fish, flatfish, mullets, halfbeaks and other fish. Alternates strong rapid wing beats with glides.
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Blue-footed Booby: Large, gull-like seabird with white body, brown wings and brown-streaked head and back. The blue-gray bill is long and stout. Legs and feet are powder blue. Plunge dives for fish from 50 feet above shallow water. Alternates rapid, deep wing beats with sailing glides.
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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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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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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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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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Bean Goose: Large goose, scaled brown upperparts, white underparts. Head, neck are dark brown. Black bill with yellow-orange saddle. Tail is dark with white undertail coverts. Legs and feet are orange. Feeds on plants, seeds, fruits. Strong direct flight on steady wing beats. Flies in V formation.
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Buff-breasted Flycatcher: Smallest Empidonax flycatcher; fresh adult has gray-brown upperparts and pale underparts washed with yellow and cinnamon. White eyering is distinct; two wingbars are white. Short bill with black upper mandible and yellow to pink lower mandible. Legs and feet are gray-black.
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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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Brown Noddy: Medium tern, brown except for white forehead blending to gray nape, and small white (lower) half-eye ring. Wedge shaped tail has small notch at tip. Black bill is long, slender. Black legs, feet. Strong, swift flight with steady wing beats. Often flies with erratic changes of direction.
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Black Noddy: medium-sized tern, very dark brown-black with white cap, white (lower) half-eye ring, and long slender bill. The wedge shaped tail has small notch at tip. Black legs and feet. Strong, swift and fluttering flight. Typically flies close to the surface of the ocean. AKA White-capped Noddy.
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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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Band-rumped Storm-Petrel: Black-brown storm-petrel with gray-brown wing bars and conspicuous white band across the rump and, large, slightly notched tail. Black bill, legs and feet. Bouyant, zigzag flight alternating several rapid wing beats with glide on horizontal or slightly downward-bowed wings.
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Bermuda Petrel: Medium petrel, gray-brown upperparts shading to black on rump; white underparts except for dusky sides of upper breast. Base of tail has white band. White face, forehead. Black-brown cap goes to eyes. In flight shows black-gray upperwings, white underwings with black margins, tips.
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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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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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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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Black Oystercatcher: Large stocky brown-black shorebird with long,bright orange bill and glaring yellow eyes with contrasting orange eyering. The legs and feet are pink. Feeds primarily on limpets and other shellfish, also eats mussels and marine worms. Rapid direct flight with shallow wing beats.
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Broad-billed Sandpiper: Small sandpiper with a long bill that curves down at the tip. Pale-edged dark brown feathers on upperparts give a scaled appearance; back shows two pale streaks in flight; underparts are white with dark spots on breast and neck. Head has dark cap and forked white eyebrows.
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Black-tailed Godwit: Large, tall godwit with black-barred, orange-brown body. orange-brown head and neck, and white mark between eye and bill; combination of prominent white rump, white wing bar, and pure white underwings is unique among the godwits. Black-tipped yellow bill is long and straight.
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Brown Shrike: Small shrike, with warm brown upperparts and buff underparts. Face is white with black mask; throat is white. Bill is short, heavy, and hooked. Tail is long and round-tipped with faint bars. Eats small snakes, rodents, birds and insect. Low, swift flight on shallow, rapid wing beats.
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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 have seriously declined since the 1960s.
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Brown Creeper: Small, tree-clinging bird with brown-streaked upperparts and white underparts. White line over eye and long, decurved bill are conspicuous. Legs and feet are pink-buff. Feeds on insects, larvae, nuts and seeds. Strong direct flights of short duration on rapid and shallow wing beats.
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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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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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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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Bald Eagle: Large, hawk-like bird, dark brown body and white head, tail. Heavy bill, legs, feet, eyes are yellow. Hunts for fish, which it sometimes steals from ospreys. Eats carrion and crippled or injured squirrels, rabbits, muskrats and waterfowl. Flap-and-glide flight, also soars on thermals.
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Broad-winged Hawk: Medium hawk, dark brown, mottled upperparts and brown-barred, white underparts. Pale underwings with black margins visible in flight. Tail is dark banded. Feeds on amphibians, reptiles, small mammals and birds, large insects. Flap-and-glide flight, soars on thermals and updrafts.
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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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Barn Owl: Medium-sized owl with glaring white, heart-shaped facial disk, no ear tufts, and long legs. Upperparts are orange-brown with fine white spots and dark bars. Underparts are white with small black spots. Feeds primarily on small mammals, also takes small birds. Slow silent mothlike flight.
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Barred Owl: Medium, large-headed owl with large, brown eyes, concentric rings around pale face, no ear tufts. Upperparts are brown with white markings. Underparts are white with dark bars on breast and dark streaks on belly. Heavily streaked, spotted, and variegated brown, white, and buff overall.
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Boreal Owl: Medium owl, white-spotted, brown upperparts and thick brown-streaked, white underparts. Head is black with numerous small white spots, facial disks bordered with black, eyes are yellow-orange. Short flights have rapid wingbeats, longer ones are bouyant with shallow, silent wing beats.
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Brown Pelican: Large, unmistakable seabird, gray-brown body, dark brown, pale yellow head and neck, oversized bill. Black legs, webbed feet. Feeds on fish by plunge diving and scooping them up with pouch. Powerful flight alternates flaps with short glides. Flies close to the water in straight line.
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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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Black-footed Albatross: Large seabird with long wings, gray-black body, and white ring around face at base of bill. Uppertail coverts are pale gray. Most have dark undertail coverts, some have white undertail and belly. The most frequently sighted albatross off the Pacific Coast of North America.
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Bristle-thighed Curlew: Large, brown-streaked shorebird with long decurved bill. Eye-line is dark, contrasting eyebrow is white. Rump is cinnamon-brown. Bristle-like feathers at base of legs are inconspicuous. Legs and feet are blue-gray. Strong, swift direct flight with legs trailing behind tail.
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Bar-tailed Godwit: Large shorebird, long upcurved bill, scaled brown, black and gray mottled upperparts, pale red-brown underparts. Tail is white with distinctive dark bars. Legs, feet are dark gray. Feeds by wading in water, probing mud with side-to-side motion. Direct flight with steady wingbeats.
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Baird's Sandpiper: Medium sandpiper with scaled, gray-brown upperparts, white underparts, and dark-spotted, gray-brown breast. Crown, face, and neck are buff with fine, dark brown streaks. Rump is white with dark central stripe extending through the center of gray-brown tail. Black legs and feet.
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Brown-crested Flycatcher: Medium-sized flycatcher with olive-brown upperparts, yellow underparts, and pale gray throat. Bill is long, stout, and solid black. Wings have rufous patches. Tail is long and rufous. Legs and feet are black. Direct flight with rapid wing beats. Hovers and dips for prey.
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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-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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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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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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Buff-breasted Sandpiper: Medium sandpiper, buff wash over entire body except for white vent. Upperparts are black-spotted and streaked, underparts are slightly scaled. Shows white wing linings in flight. Has white eye-ring and black bill. Legs are yellow. Swift direct flight with rapid wing beats.
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Blue-winged Teal: Small dabbling duck, purple-gray head, distinct white crescent on face. Upperparts are scaled buff, dark brown; underparts are pale brown with numerous dark spots. Wings have green speculum, pale blue shoulder patch visible in flight. Fast direct flight with steady wing beats.
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Baikal Teal: Small dabbling duck, head pattern of pale brown, green, white, and black. Pink breast has dark spots, flanks are gray bordered with vertical white stripes, scapulars are brown, black, and white. Wing speculum is green with buff upper and white lower border. Black undertail coverts.
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