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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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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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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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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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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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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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Spotted Redshank: Large sandpiper, mostly black body except for white rump, white spots on wings, barred tail. Bill is red with black tip. Legs and feet are dark red. Feeds and forages on land or in shallow water by probing in mud, and sweeping bill back and forth. Swift direct flight when flushed.
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Spectacled Eider: Smallest of the Eiders, has orange bill, white upperparts, black underparts, breast, sides, black pointed tail, yellow-green head and large white "goggles" bordered with black. White feathers on the upper mandible extend past nostril. Rapid direct flight in straight line formation.
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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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Spot-billed Duck: Native of Asia, named for red spots at base of yellow-tipped black bill; subspecies occurring in North America generally lacks these spots. Scaled brown overall with buff face, neck, upper breast. Dark crown, nape, eyestripe. Blue speculum with white borders; orange legs and feet.
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Sky Lark: Medium lark (pekinensis), dark-streaked, brown upperparts and white underparts with streaks on breast, sides. The head has indistinct crest and white eyebrows. Tail is dark with white edges. Forages on ground by walking and running. Feeds mostly on seeds, grains, and insects.
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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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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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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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Spotted Sandpiper: Medium sandpiper, olive-brown upperparts, white underparts with bold black spots. Eyestripe is white. Wings have white stripes visible in flight. Tail is barred. Dull yellow legs. Low direct flight, wings flap in shallow arcs, producing clipped, stiff wing beats on drooping wings.
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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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Snowy Owl: Large, white owl with variable black bars and spots. The head is round and lacks tufts, eyes are yellow, and the bill is black. Feathered feet and toes provide protection from the arctic cold. Direct flap-and-glide flight with powerful, deep wingbeats. North America's only all-white owl.
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Short-eared Owl: Medium owl, light and dark brown mottled upperparts and dark-streaked, pale buff underparts. Head has large, round, pale buff facial disk with fine, brown tinges, black around eyes, and small ear tufts. Eyes are yellow and bill is black. Flight is erratic with flopping 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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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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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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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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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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Short-billed Dowitcher Breeding Adult: Large sandpiper, upperparts mottled gray, black, brown and red-brown, white rump, red-brown underparts with heavy spots, and bars (east and west coast birds have heavier barred and spotted, paler underparts and often show white bellies). Strong direct flight.
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Snow Goose: Large goose with two color phases. White phase is all white with black wing tips. Blue phase has white head and neck, blue-gray upperparts, gray-brown breast and sides, white belly. Pink bill, black lower mandible. Pink legs, feet. Strong direct flight in bunched flocks or U formations.
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