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Least Tern: Small tern, slate-gray upperparts, white underparts. Crown, nape are black and forehead is white. Black leading edge of outer wing conspicuous in flight. Tail is forked. Bill and feet are yellow. Fast smooth flight with rapid wing beats. Hovers briefly before dipping down to sieze prey.
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Lesser Yellowlegs: Large sandpiper with gray and black mottled upperparts, white underparts and streaked upper breast and sides. Bill is straight and uniformly dark gray. White lower rump and dark-barred tail are visible in flight. Legs are long and yellow. Swift direct flight with rapid wing beats.
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Little Stint: Medium sandpiper, scaled-brown upperparts, white underparts. Face, neck, breast are rust-brown with black spots. The back has white lines that form a V pattern in flight. Black bill, legs, feet. Feeds by pecking at surface and probing mud with bill. Direct flight with rapid wing beats.
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Laysan Albatross: Large seabird with dark brown back and white head, neck, and rump. Eye patch is dark. Bill is thick and yellow with gray, hooked tip. Wings are dark brown above and white below with irregular brown-black borders. Tail is dark brown-black with white coverts. Legs and feet are pink.
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Little Curlew: Medium curlew, brown-streaked upperparts, white throat, dark-streaked gray breast, and white belly. Head has brown crown, white eyebrows. Bill is short and slightly down-curved. Legs and feet are blue-gray. Forages in grassy fields. Bouyant direct flight with steady, rapid wing beats.
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Long-billed Dowitcher: Large, stocky sandpiper with dark, mottled upperparts, dark cap and eyestripe, short white eyebrow, and red-brown underparts with lightly barred flanks. Bill is long, dark, and dagger like. Legs and feet are yellow-green. Swift direct flight, rapid 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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Laughing Gull: Medium gull, gray back, white underparts. Head has black hood, neck is white, and bill is red. Wings are gray and white-edged and black at tips; tail is white. Legs and feet are black. Slow flight with deep wing beats. Soars on updrafts. Named for its laughterlike call.
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Lesser Nighthawk: Medium-sized nightjar with gray and white mottled upperparts, white throat, and brown and white mottled underparts with dark belly bars. Wings are dark with conspicuous pale patches visible in flight. Tail is dark brown and has thin white bars across top. Darting erratic flight.
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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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Long-tailed Jaeger: Small jaeger with gray upperparts, white breast, gray belly. Black cap covers eyes, crosses chin and ends at yellow nape. Upperwings are dark-edged. Tail is gray with black edges and long, black streamers. Legs are blue-gray and toes are webbed. Hovers before dipping for prey.
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Long-tailed Duck: Small diving duck, black upperparts, head, neck, breast, wings; back is black and brown mottled; white flanks, belly, undertail coverts. Black tail has long, pintail-like central feathers that are often submerged when swimming. Pale gray mask, black bill with dark pink saddle.
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Least Sandpiper: Small sandpiper, brown-scaled upperparts, rust-brown crown. Breast, throat are dark-spotted; belly, undertail are white. Wings have thin, white stripes visible in flight. Black line on rump extends onto tail. Legs and feet are yellow-green. Swift direct flight with rapid wing beats.
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Lesser Sand-Plover: Medium-sized, chunky plover with gray upperparts, white underparts, and bright rust-brown breast band and nape. The head has gray-brown cap and thick black eyestripe broken by a white forehead. Throat is white with a black border. Bill is black and legs and feet are yellow-green.
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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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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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Lilac-crowned Parrot: Medium green parrot, pale purple crown, red forehead. In flight shows blue-black trim on flight feathers and large red patch on secondaries. Hooked bill is dull yellow. Legs, feet are blue-gray. Feeds on fruits and seeds. Native to pacific coastal Mexico. AKA Finsch's Amazon.
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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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Leach's Storm-Petrel: Medium storm-petrel with dark brown body and white rump and undertail feathers. Wings are dark with pale gray-brown bar on upperwings. Long tail is dark and forked. Bill, legs, and feet are black. Its flight is bounding and erratic, with frequent changes of direction and speed.
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Le Conte's Thrasher: Medium thrasher with plain gray or gray-brown body with paler throat and rufous undertail feathers. Eyes are dark. Bill is long, decurved, and black. Tail is long and dark. Legs and feet are black. Feeds on insects and their larvae, spiders, fruits and berries.
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Least Storm-Petrel: Small, very rare storm-petrel with dark black-brown body and short, wedge-shape tail. The wings have black wing tips and pale brown diagonal bars visible in flight. It is the smallest Pacific storm-petrel. Flight is swift and direct on deep wing beats. Often flies low over water.
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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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Lesser Scaup: Medium diving duck with finely barred gray back and gray-washed white underparts. Head, neck, and breast are black with purple gloss. Eye is yellow. Bill is blue-gray. Wings are black with large, white patches; tail is black. Dives for food. Swift direct flight with rapid wing beats.
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Least Bittern: Very small, secretive heron with black cap and back, and white throat and belly. Wings have conspicuous pale brown patches visible in flight. The bill, legs and feet are yellow. Feeds on fish, insects, small amphibians, crustaceans and invertebrates.
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Long-eared Owl: Medium-sized owl with gray-brown body with pale bars and heavy streaks on underparts. The facial disc is rufous with white a patch below the bill. The ear tufts are close together, long, black and rufous, and are not visible in flight. Bouyant, mothlike flight with silent wing beats.
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Little Blue Heron: Medium heron with slate-gray body and purple-blue head and neck. Eyes are yellow and bill is dark gray with black tip. Legs and feet are dark. The only dark heron species in North America in which the juvenile is white. Feeds on small crustaceans, vertebrates, and large insects.
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Long-billed Curlew: Very large sandpiper with brown mottled upperparts, buff-brown underparts with dark streaks and spots. Bill is very long, decurved. Cinnamon-brown underwings visible in flight. Feeds by probing mud with bill or dunking head under water. Direct flight, steady, strong wing beats.
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Long-billed Murrelet: Small seabird with dark brown upperparts and darker brown barring, paler throat and white eye-ring. Underparts are lighter brown with brown barring. Straight black bill. Legs and feet are brown. Strong fast direct flight, often close to the water on rapid wing beats.
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Loggerhead Shrike: Medium shrike with gray upperparts and paler gray underparts. Mask is black and throat is white. Bill is heavy and slightly hooked. Wings are black with white patches. Tail is long, black, and white-edged. Low, swift flight, alternates 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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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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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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