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Green-tailed Towhee: Large sparrow, olive-green upperparts and pale gray underparts. Crown is rufous, throat is white with black stripes, and bill is gray. Wings and tail are edged with olive-yellow. Rapid bouncy flight, alternates several quick wing beats with wings pulled to sides.
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Spotted Towhee: Large sparrow, white-spotted black back, black rump. Black breast, white belly, rufous sides. Head is black and eyes are red. Wings are black with white spots. Tail is long and black with white corners. Short, bounding flights, alternates rapid wing beats with wings pulled to sides.
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Cassin's Sparrow: Medium, skulking grassland sparrow, fine brown streaks on gray-brown head and back, buff underparts. Tail is long, rounded, white-tipped. Legs, feet are pink-orange. Forages by scratching on the ground. Short flight, alternates several rapid wing beats with wings pulled to sides.
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American Tree Sparrow: Medium, gray-brown sparrow, black and rufous-brown streaks on back, wings. Crown, eyestripes, flanks are rufous-brown, contrasting with gray face. Pale gray breast with dark central spot, rufous-brown sides. Upper mandible is dark gray, lower mandible is yellow.
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Field Sparrow: Medium sparrow, rufous back with dark streaks, unstreaked, buff breast. Gray-brown rump. Gray head, rufous cap, and white eye-ring. Pink bill, legs and feet. Forages on ground or low shrubbery. Short flights, alternates rapid wing beats with brief periods of wings pulled to the sides.
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Chipping Sparrow: Medium, slender sparrow with black-streaked brown back and pale gray underparts. Cap is rufous, nape is gray, throat is white, and face stripes are black-and-white. Black bill. Pink-orange legs and feet. Short flight, alternates several rapid wing beats with wings pulled to sides.
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Clay-colored Sparrow: Medium sparrow with black-streaked brown upperparts and buff underparts. The face is pale with finely streaked crown, crisp brown cheek patch, white eyestripe, and gray nape. Pink-gray legs and feet. Short flight, alternates several 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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Lark Sparrow: Medium sparrow with streaked, gray-brown upperparts and buff underparts with black breast spot. Head has black, white, and chestnut-brown stripes. Tail is long and black with white edges. Short, fluttering flight, alternates rapid wing beats with wings pulled to sides.
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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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Sage Sparrow: Medium sparrow, dark-streaked brown back, white underparts with central breast spot, streaks on sides. Gray head has white patch in front of eye. White throat has dark moustache stripe. Brown wings, two faint bars. Long tail is dark, white edged. Coastal form is darker.
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Grasshopper Sparrow: Medium sparrow with brown-streaked upperparts and white underparts. Face, flanks, and breast are plain buff-brown. Head is flat with central white stripe though dark crown. Upper mandible is gray, while lower mandible is yellow. Pink legs and feet. Named for its insectlike song.
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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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Le Conte's Sparrow: Small sparrow, brown-streaked back, brown-streaked gray nape, pale gray underparts with streaks on sides, yellow breast. Head is flat, black-capped with a white median line. Face is yellow-orange with gray cheeks, black eye-line forming a T behind eye. Legs, feet are pink-brown.
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Fox Sparrow: Large sparrow, varies from dark or gray-brown in the west, rufous in the east; upperparts may be so dark that back pattern is hard to see. Heavily streaked upperparts, converging at midbreast into a large, dark spot. Rust-brown tail. Bill has dark upper mandible, yellow lower mandible.
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Lark Bunting: Large sparrow, nearly black with large white wing patches, short, white-edged tail, and heavy, blue-gray bill. Forages in groung, low vegetation. Strong flight, alternates shallow wing beats with brief periods of wings pulled to sides. It is the state bird of Colorado.
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Savannah Sparrow: Small sparrow, dark-streaked, gray-brown upperparts, white underparts, heavy streaks on breast and sides. Head has a brown crown with pale central stripe and pale yellow or white eyebrows. Brown wings have two pale bars. Tail is short and notched. Pink legs and feet.
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Lincoln's Sparrow: Medium sparrow, dark-streaked pale brown upperparts, white underparts with dark streaks. Head has brown crown with gray central stripe, broad gray eyebrows and nape, pale eye-ring, and brown streak extending behind eye. Upper mandible is dark, lower mandible is pale orange-brown.
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Song Sparrow: Medium sparrow, heavily streaked gray-brown upperparts. Dull white underparts have dark central breast spot, thick streaks. Head has brown crown, paler median stripe, pale gray eyebrow, white chin, dark brown moustache stripe. Rust-brown wings. Tail is long, usually tinged rust-brown.
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Vesper Sparrow: Medium sparrow, black-streaked gray-brown upperparts, white underparts, and streaked breast and sides. White face has brown cheek patch and white eye-ring. Wings are gray-brown with two pale bars and rufous shoulder patches. Tail is notched and dark with white edges.
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Swamp Sparrow: Small sparrow with dark-streaked brown upperparts, gray upper breast, and pale gray, faintly streaked underparts. Head has rust-brown cap with paler median stripe and gray face. The wings are rust-brown with black-and-white streaks. Eats seeds, insects. Pink legs, feet.
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Harris's Sparrow: Large sparrow with dark-streaked, brown upperparts and white underparts with dark-streaked sides. Head has stark black crown, face, and throat. Gray cheek patch is marked by a thin, black line. Bill is pink. Alternates rapid wing beats with brief periods of wings pulled to sides.
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White-throated Sparrow: Medium-sized sparrow with rust-brown striped upperparts, conspicuous white throat, and plain gray underparts. Head has black-and-white striped crown and yellow spots between eyes and bill. Short flights, alternates rapid wing beats with wings pulled to sides.
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White-crowned Sparrow: Medium-sized sparrow with brown-streaked upperparts, small white throat patch, and plain gray underparts. The white crown has distinct black lines. Wings are brown with two pale bars. Short flights, alternates rapid wing beats with brief periods of the wings pulled to sides.
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Dark-eyed Junco: Medium sparrow with considerable geographic color variation, although all exhibit a pink bill, dark eyes, white belly, dark-centered tail with white outer feathers. Short flight with white outer tail feathers flashing, alternates several rapid wing beats with wings pulled to sides.
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Chestnut-collared Longspur: Small, sparrow-like bird with brown-streaked upperparts, black breast and flanks, some have chestnut on underparts, pale gray belly. Face is buff with black stripe behind eye. Nape is chestnut-brown, crown is black, and throat is white. Tail is black with strongly contrasting white outer tail feathers.
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McCown's Longspur: Medium-sized sparrow with streaked gray upperparts, plain gray underparts, and darker breast. The head has a black crown, white face and throat, and a stout, heavy bill. White tail has diagnostic black inverted T. Wings have chestnut-brown bars. Black legs and feet.
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Lapland Longspur: Medium sparrow-like bird, brown-streaked black back. Underparts are white, streaked black on sides, flanks. Crown, face, and throat are black; nape is red-brown. Broad white stripe from eye to sides of breast. Bill is yellow with dark tip. Tail is long, white edges.
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Snow Bunting: Medium-sized, strikingly white sparrow with black back, central tail, and wing tips. Bill, legs and feet are black. Forages on ground for seeds, insects, larvae and caterpillars. Swift flight, alternates rapidly beating wings with brief periods of wings pulled to sides.
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Rose-breasted Grosbeak: Large finch, black head, back, bright red breast, and white rump, sides, belly. The wings are black with white patches above and red, white, black below. Long, slightly notched black tail with white patches. Eats seeds, caterpillars, insects, tree flowers, fruits and berries.
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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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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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Bobolink: Small, lark-like blackbird, all-black except for buff nape, white rump, and white wing patches. Tertials and wing coverts are lined with buff. Tail feathers are sharply pointed. Legs and feet are gray. Eats caterpillars, insects, seeds and grains. Strong undulating 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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Gray-crowned Rosy-Finch: Medium finch with brown body and pink on shoulders, flanks, and belly. Forehead is dark brown. The black bill turns yellow with a dark tip in the winter. Back of head and belly have gray patches. Forages in bushes, trees and on ground for seeds and insects. Bounding flight.
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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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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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Cassin's Finch: Medium-sized, cheery finch with bright red crown, brown-streaked back. White belly, buff neck,upper breast and rump. Bill tapers evenly to a sharp point. Forages on ground and high in trees, eats mostly conifer seeds and buds, some insects. Swift bounding flight on rapid wing beats.
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House Finch: Medium-sized finch with brown-streaked back and wings, and brown-streaked white underparts. Head, throat, and rump are pink-red. Tail is relatively long and weakly notched. Bill is short and slightly decurved. Feeds mostly on seeds, takes some insects and fruits. Swift bounding flight.
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Red Crossbill: Medium finch with red-orange body, brighter red rump, and dark brown wings. Bill is dark and crossed at tip. The tail is notched. Legs and feet are gray-black. Eats seeds, insects and caterpillars. Swift bounding flight, alternates rapid wing beats with wings pulled briefly to sides.
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White-winged Crossbill: Medium crossbill, bright pink overall except for black wings with two bold white wing-bars. Belly has dull white center; white undertail coverts. Black tail, deeply notched. Swift bounding flight, alternates rapid wing beats with wings pulled to sides.
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Pine Grosbeak: Large, robust finch with red-washed black back, gray sides and undertail coverts, and pink-red rump and underparts. Head and face are pink-red; bill is heavy and black. Wings are black with two pale bars. Tail is black and slightly notched. Feeds on seeds, buds, fruits and insects.
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Pine Siskin: Small finch with brown-streaked body. Wings have small patches of yellow and two white wing-bars. Tail is dark, notched, and has small yellow patches. Bill is slender and pointed. Forages on ground and in trees for seeds and insects. Flight is swift and high, travels in compact flocks.
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American Goldfinch: Small, noisy finch. Male has a bright yellow body, black cap, wings, and tail, and white rump and undertail coverts. Wings have flashy white patches and bright yellow shoulder bar. Bill is conical. Undulating flight, alternates several rapid wing beats with wings pulled to sides.
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Lesser Goldfinch: Small finch with dark back (black in the east, dark green in the west), black crown, bright yellow underparts. Wings, tail black with white markings. Forages in shrubs, brush, weedy fields for seeds and insects. Swift flight, alternates rapid wing beats with wings pulled to sides.
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Common Redpoll: Small finch, brown-streaked gray upperparts, bright rose-pink breast, boldly streaked flanks and undertail coverts. Red cap and black chin. Bill is olive-brown with fine black tip. Wings are dark with two narrow white bars; tail is black and notched. Black legs, feet.
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Evening Grosbeak: Large, stocky finch, bright yellow back, rump, and underparts. Head is brown with heavy, pale bill; bright yellow eyebrows extend onto forehead. Dark wings with bold white secondary patches; dark tail. Feeds on insects, buds, sap, seeds, fruits and berries. Swift bounding flight.
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House Sparrow: Medium-sized, stocky sparrow with black-streaked brown upperparts and pale gray underparts. Wings are brown with single white bar. Cheeks and crown are pale gray, contrasting with black throat, upper breast, and bill. Legs are shorter and black bill is thicker than in native sparrows.
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