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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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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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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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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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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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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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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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Short-tailed Albatross: Largest and only white-bodied albatross in the North Pacific. The head and nape have a golden-yellow cast. White wings have black edges and tips. Tail is white with black fringe. Legs and feet are pink-gray. AKA Steller's Albatross. Almost became extinct in late 19th century.
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South Polar Skua Dark: Small, gull-like skua, occurs in two color phases. Dark phase adult has dark brown body, large white patch at base of primaries visible in flight. Dark bill, thick and heavy; short, broad tail. Light phase adult has pale gray-brown head and underparts. Strong direct flight.
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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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Saffron Finch: Native to South America. Upperparts are yellow-green, underparts are yellow. Crown is orange. Wing and tail feathers are black edged with yellow. Bill is gray on upper mandible and ivory on lower mandible. Legs and feet pink-gray. Undulating flight, alternates flapping and gliding.
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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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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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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 Egret: Medium-sized, totally white egret with a long slender black bill with yellow lores. The eyes are yellow and legs are black while feet are bright yellow. The head, neck and back have long, lacy plumes during breeding season. Generally silent and feeds on crustaceans, insects, and fish.
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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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Stilt Sandpiper: Medium sandpiper with gray-brown upperparts, white rump, heavily barred white underparts. Head has a dark cap, white eyebrows, and brown ear patches. Bill is long, black, and curved down at tip. Legs are long and gray-green. Powerful, direct flight on long, rapidly beating wings.
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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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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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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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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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