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Surf Scoter: This medium-sized diving duck is entirely black except for white patches on the forehead and nape. It has an orange, black and white bill, white eyes and orange legs and feet. The female is less distinctly marked with smudgy face patches and dark bill. It dives for food, primarily mollusks and crustaceans. Rapid direct flight with strong wing beats. Flies in straight line formation.
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Sanderling: This medium-sized sandpiper has dark-spotted, rufous upperparts and breast, white underparts and black bill, legs and feet. Wings have conspicuous white stripes visible in flight. Feeds on crustaceans, mollusks, isopods, worms, plants and insects. Swift direct flight with rapid wing beats. Sexes are similar.
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Short-billed Dowitcher: This large sandpiper has mottled gray, black, brown and red-brown upperparts, white rump, red-brown underparts with spots and bars, a long, straight dark bill and long, dark yellow-green legs. East and west coast birds are heavier barred and spotted, paler underparts and often show white bellies. Diet includes insects and crustaceans. Strong direct flight. Sexes similar.
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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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Sharp-tailed Sandpiper: This medium-sized sandpiper has dark brown upperparts and white underparts with faint olive-brown streaks on breast and sides. It has a rufous crown, white eye ring and dark brown wings. The tail is dark brown and pointed in flight. Feeds primarily on mosquito larvae but also takes mollusks and crustaceans. Swift direct flight with rapid wing beats. Sexes are similar.
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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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Summer Tanager: Large tanager, dark-red overall with a large, pale gray bill. Legs and feet are gray. It is the only entirely red bird in North America. Female has olive-yellow upperparts and dull yellow underparts. Some red morph females have a red wash, red splotches, or are entirely red. It specializes in eating bees and wasps, which is why it is also known as the bee bird. Swift direct flight with quick wing strokes.
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Scarlet Tanager: Medium tanager with brilliant red body, black wings, tail. The only bird in North America with this unique plumage. Heavy bill is yellow-gray. Gray legs and feet. Winter male has dull green upperparts, yellow-green underparts, often interspersed with red during molt.
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Smith's Longspur: Medium sparrow, yellow-brown streaked upperparts, black head with white eyebrow and ear patch, and yellow-brown nape, throat, and underparts. Wings have large white bars. Tail is black with white edges. Yellow-brown legs and feet. Feeds on seeds, spiders, and insects.
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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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