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Saltmarsh Sharp-tailed Sparrow: Small sparrow, pale-streaked gray back, white throat, heavily streaked buff breast and sides, white belly. Head has dark cap, eyestripe, thick, orange-brown eyebrows and gray ear patches. Gray wings with orange-brown shoulders. Brown tail is pointed.
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Seaside Sparrow: Medium sparrow (maritimus), streaked olive-gray upperparts, pale buff underparts, streaks on breast, sides. Head has yellow streak between eye, bill. Long bill, thick base. Short, pointed tail. Short flights, alternates rapidly beating wings with wings pulled to sides.
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Swainson's Thrush: Medium-sized thrush (swainsoni), with dull olive-brown or olive-gray upperparts, pale buff eye-ring, dark moustache stripe, and brown-spotted buff throat and breast, and white belly. Legs and feet are pink-gray. Flies in a swift, direct flight with rapid wing beats.
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Siberian Rubythroat: Medium-sized thrush with olive-brown upperparts, bright red throat, gray breast and sides, and white belly. Head has white stripes above and below eyes. Wings and tail are olive-brown. Often cocks tail upward. Forages on ground for various insects and berries.
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Swainson's Warbler: Medium-sized warbler with olive-brown upperparts and pale gray underparts. Head has brown cap, white eyebrows, and dark eye-lines. Wings are plain olive-brown. It hides in dense thickets, where it forages on the ground looking for insects, spiders, and caterpillars.
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Sora: Small rail with dark gray-brown upperparts with black-and-white streaks. Breast is gray and flanks and belly are dark gray with white bars. Gray head has a darker crown and nape, and black face, chin, and throat. Bill is yellow with dark tip. Low, weak, and floppy flight over short distances.
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Sooty Shearwater: Large shearwater with dark gray-brown body, darkest on tail and primaries. Underwing coverts are pale. Bill is long and dark. Legs and feet are black. Eats fish, squid and crustaceans. Long, narrow wings are slightly swept-back. Alternates strong direct flapping with long glides.
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Stejneger's Petrel: Small petrel with gray-brown upperparts, dark gray rump, white underparts. Black head, nape, bill. White face. Gray-brown upperwing, black greater coverts and outer primaries forming an M pattern across lower back. Legs and feet are blue-gray. Gray-brown tail mottled with white.
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Sage Thrasher: Small thrasher, gray upperparts, dark-streaked white underparts with pale brown wash. The head is gray, bill is short and slightly decurved. Wings are dark with thin,white bars. Tail is dark with white corners. Legs and feet are black. Fast flight on shallow wing beats.
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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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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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Scaled Quail: Large quail AKA "cottontop," due to its white-tipped gray crest; nape, neck underparts have dark-edged gray and buff feathers creating a distinctly scaled look. Upperparts are plain gray with white stripe at base of wings; sides are gray with short white stripes. Pale brown legs, feet.
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Siberian Accentor: Small, shy sparrow-like bird with brown-streaked upperparts, gray nape and crown with dark gray center stripe, yellow-brown eyebrows and underparts; breast shows brown streaking. Wings have a white wingbar. The tail is notched, the bill is short and black. Legs and feet are pink.
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Sooty Grouse: Large, chicken-like bird, dark gray to blue-gray with yellow-orange eye comb, black tail with wide pale gray terminal band. Patch of yellow skin with red veining on neck surrounded by white feathers is displayed during courtship. Formerly (with Dusky Grouse) known as the Blue Grouse.
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Slaty-backed Gull: Large gull, slate-gray back, upper wings; dark outer primaries separated from mantle by row of white spots. Gray underside of primaries; broad white trailing edge to wings. Bright pink legs, feet. Yellow eyes with red orbital ring. Yellow bill has red spot near tip.
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Sandwich Tern: Only medium-sized tern with long slender black bill tipped with yellow; upperparts are very pale gray, nearly white, and underparts are white. The black crown has a short black crest. White tail is deeply forked; legs and feet are black. Direct flight, hovers before diving for fish.
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Slate-throated Redstart: Medium warbler with slate-gray upperparts, black face, throat, red breast, belly, and chestnut-brown crown. The tail is slate-gray with white edges and the wings are black. Insects make up most of its diet caught on the wing and it also forages on the ground.
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Scissor-tailed Flycatcher: Medium flycatcher with pale gray upperparts and head, white underparts and throat, salmon-pink sides and flanks, and dark brown wings with white edges. Tail is long and scissor-like, black above with white outer edges and white below with black inner edges.
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Shy Albatross: Large seabird with white body and gray back. The bill is gray with a yellow tip and base. Underwing is white with diagnostic narrow black margin. Tail is gray. Legs and feet are pink. Soaring flight on stiff, slightly drooped wings. Often interuppted with several slow deep wing beats.
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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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Spotted Dove: Medium dove with gray-brown upperparts and pink-brown underparts. Head has a pale gray cap, dark eye-line, and white-spotted black nape patch. The tail is long and gray with black edges and white corners. Bill is black, legs and feet are pink. Swift direct flight with rapid wing beats.
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Sandhill Crane: Large wading bird with gray body, white cheeks, chin, upper throat, and bright red cap. Bill is dark and eyes are yellow. Legs and feet are black. Direct, steady flight on heavy and labored wing beats. Slow downstroke, rapid and jerky upstroke. Flies in V or straight line formation.
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Sharp-shinned Hawk: Small hawk with blue-gray upperparts and rufous bars on white underparts. Eyes are dark red. Wings are short and rounded. Tail is long and squared with heavy bars. Legs and feet are yellow. Flight consists of rapid wing beats followed by a short glide. Often soars on thermals.
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Steller's Sea-Eagle: Large eagle, mostly black except for white forehead, shoulders, rump, lower belly, and leg feathers. Bill is large, heavy, and orange. Legs and feet are yellow. Tail is long, white, and wedge-shaped. Rare visitor to Alaska. Alternates deep wing beats with short to long glides.
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Say's Phoebe: Medium-sized, active flycatcher with gray-brown upperparts and head, paler gray throat and upper breast, and pale rufous belly and undertail coverts. The wings and tail are dark gray. Feeds primarily on insects. Weak fluttering flight with shallow wing beats. Hawks from perch, hovers.
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Semipalmated Sandpiper: Small sandpiper with scaled gray-brown upperparts, white underparts, and fine streaks on the breast and sides. The black bill is short, stout and straight. Feeds on insects, worms, small mollusks and crustaceans. Legs and feet are black. Swift flight on rapidly beating wings.
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Semipalmated Plover: Small plover, gray-brown upperparts and white underparts. Forehead and faint eyebrows are white, while face and collar are black. Bill is orange with black tip. Wings have white stripes visible in flight. Tail is brown with white edges. Orange legs, feet. Strong direct flight.
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Sabine's Gull: Small gull with gray back and white nape, rump, and underparts. Hood is solid black and eye-ring is dark red. Bill is black with yellow tip; legs and feet are black. The upperwings are gray with black primaries and white secondaries. Tail is slightly forked when folded.
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