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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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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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Lanceolated Warbler: Medium warbler with streaked gray-yellow body. Underparts are white, brown streaked breast, flanks and undertail coverts. Brown legs, feet. Rare visitor to Alaska. Feeds on spiders, insects and their larvae. Direct flight close to the ground on shallow wing beats.
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Lucy's Warbler: Small warbler with pale gray upperparts, rust-brown crown and rump, white underparts. Eye ring is white. Wings are solid gray. Bill, legs and feet are black. It was named for Lucy Hunter Baird, daughter of Spencer F. Baird, ornithologist and secretary of the Smithsonian Institution.
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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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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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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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Ladder-backed Woodpecker: Small woodpecker with black-and-white barred upperparts, shoulders, and wings, underparts are buff-gray with black spots, buff-gray face, red crown, and black forehead, nape, rump, and tail. Outer tail feathers are white barred. Bill, legs and feet are black.
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Little Bunting: Small finch with dark-streaked gray-brown upperparts, heavily streaked white underparts. Face and crown are chestnut-brown and black-bordered. Eye-ring is dull white; throat is white. Wings have two pale, thin bars. Legs, feet are yellow. Tail has white outer feathers.
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Lazuli Bunting: Small finch, bright blue upperparts, cinnamon-brown breast and sides, white belly. Dark wings with white wing bar. Forages on ground, low in trees and bushes. Eats seeds, insects, caterpillars. Short flights, alternates rapid wing beats with brief periods of 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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Lawrence's Goldfinch: Small finch with gray nape and back and yellow-gray rump. Underparts are white; breast is yellow. Cap and face are black. Wings are dark with bright yellow bars. Feeds on seeds and insects. Swift bounding flight, alternates rapid wing beats with wings pulled briefly to sides.
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Lewis's Woodpecker: Medium woodpecker with black upperparts, hood. Face is dark red, collar is gray, belly is pale red. The bill, legs and feet are black. It was named for Meriwether Lewis of the Lewis and Clark expedition. Its dark plumage sets it apart from all other North American woodpeckers.
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Louisiana Waterthrush: Large ground-dwelling warbler, dark olive-brown upperparts, heavily streaked white underparts with buff wash on belly and sides. White throat; eyestripe is dark and thick, white eyebrows widen behind eyes. Bill is long and heavy. Tail is short with pale buff undertail coverts.
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