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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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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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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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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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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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Short-tailed Shearwater: Medium shearwater with dark brown body and occasional traces of white in the center of upperwings. Bill is short and dark. Feet are dark gray and trail slightly behind tail in flight. Tail is rounded. Alternates strong flaps with long glides, often soars for long periods.
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Streaked Shearwater: Large shearwater with scaled, dark gray-brown upperparts, white underparts. White head has variable light to heavy pale brown streaks. Uppertail coverts can be white, forming a pale "horseshoe." The forehead is white. Bill is pale. Legs and feet are pink. Eats small fish and squid. Flies with loose, angled wings. Light, graceful flapping and gliding.
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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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Sooty Tern: Medium-sized tern with long wings, deeply forked tail, black crown, nape, and upperparts, and a broad triangular white forehead patch. Underparts are white; upper tail is black with white outer edges. Direct flight with strong, shallow wing beats. Hovers before dipping for prey.
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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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Spoon-billed Sandpiper: Small sandpiper, scaled brown and black upperparts, red-brown wash on face, neck, spotted upper breast, white underparts. Most distinguishing characteristic is the extraordinarily flared tip on its black bill. Black legs, feet. Flight is swift and direct on rapid wing beats.
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Sanderling: Medium-sized sandpiper with dark-spotted, rufous upperparts, breast and white underparts. Wings have conspicuous white stripes visible in flight. Bill, legs, and feet are black. Feeds on crustaceans, mollusks, isopods, worms, plants and insects. Swift direct flight with rapid wing beats.
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Surf Scoter: Medium diving duck, entirely black except for white patches on forehead and nape. Bill is orange, black, and white. Eyes are white. Legs and feet are orange. Dives for food, primarily mollusks and crustaceans. Rapid direct flight with strong wing beats. Flies in straight line formation.
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Surfbird: Medium sandpiper, dark gray upperparts marked with rufous, white rump, white underparts marked with distinct black chevrons. Upper breast, head, neck are heavily streaked. Wings are dark with bold white stripes visible in flight. Tail is white with a black triangular tip visible in flight.
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Steller's Eider: Small eider with black back and collar, white sides, buff-brown underparts with small but distinct black spot on side. White head has a dark tuft, black eye patch and chin. Wings are white with black primaries and a white-bordered blue speculum. Blue-gray bill, legs and feet.
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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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Sharp-tailed Sandpiper: Medium sandpiper with dark brown upperparts and white underparts with faint olive-brown streaks on breast and sides. Head has rufous crown, white eye ring and eyestripe. Wings are dark brown. Tail is dark brown and pointed in flight. Swift direct flight with rapid wing beats.
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Solitary Sandpiper: Medium sandpiper, pale-spotted, dark brown back and rump, white underparts with streaks on neck and sides. Head is dark, eye-ring is bold white. Tail is black with conspicuous black-and-white barred edges. Bill, legs, and feet are olive-green. Direct flight is light and bouyant.
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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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Snowy Plover: Small plover, pale brown upperparts, white underparts. Dark patches on either side of upper breast (partial breast band), behind eye, and on white forehead. Bill, legs, and feet are black. Wings have white stripes visible in flight. Dark tail has white edges. Dark gray legs and feet.
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