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Audubon's Shearwater: Small, stocky seabird with dark brown upperparts and white underparts. Underwing coverts are white. Tail is dark brown with short, gray undertail coverts. Bill is dark and legs and feet are pink. Fish and squid make up most of its diet. Alternates rapid wing beats with glides.
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Northern Fulmar Light Morph: Large gull-like bird with gray upperparts and white underparts, head, neck, and tail. Dark morph has uniformly dark gray body and paler primaries. Bill is short, thick, and yellow with a tube on top. Flight alternates stiff wing beats with periods of gliding and banking.
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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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Arctic Tern: Medium, slim tern with gray upperparts, black cap, white rump and throat, and pale gray underparts. Tail is deeply forked and white with dark edges on outer feathers. Bill is dark red, rarely tipped with black. Legs and feet are red. Bouyant graceful flight with steady wing beats.
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Black Tern: Small tern with black head, bill and underparts. Back, wings, and tail are silver-gray. Vent is white; legs and feet are dark red but may appear black. Bouyant direct flight with deep rapid wing beats, hovers for insects. Uneven foraging flight. Plunge dives on occasion.
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Black-headed Gull: Medium-sized gull with pale gray back and upperwings and dark brown face and partial hood. Nape, neck, breast, belly, and tail are white. Bill and legs are dark red. Wings have white triangular panel formed at the leading edge of black-tipped primaries in flight.
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Black-legged Kittiwake: Medium-sized white gull with pale gray back and upperwings and black wing tips. Bill is yellow, legs and feet are black. Swift graceful flight, alternates several rapid shallow wing beats with a glide. Often hovers over water before diving for prey at surface.
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Bonaparte's Gull: Medium gull with black head and bill, gray back and wings, white underparts and tail. White outer primaries with black trailing edges are visible in flight. Legs are red-orange. Catches fish by wading and diving. Light and direct flight with rapid wing beat, ternlike.
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Caspian Tern: Large, stocky tern with pale gray upperparts, white underparts. Cap is black and may appear weakly crested; large bill is coral-red. Undersides of primaries are gray. Tail is white, relatively short, and slightly forked; legs are black. Hovers above water before diving.
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Common Tern: Medium tern, medium gray upperparts, pale gray underparts, glossy black cap and nape. Wings are dark-tipped and have dark leading edge on forewing. Red bill is black-tipped. Legs are red and tail is deeply forked and elongated. Direct flight, hovers above water before diving for prey.
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Forster's Tern: Medium tern, pale gray upperparts, black cap, white underparts. Bill is orange, black tip. Wings are pale gray with paler primaries. Tail is pale gray, deeply forked with dark inner edge, white outer edge. Orange legs, feet. Hovers above water before diving for prey.
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Franklin's Gull: Medium gull, gray back, white underparts. Head is black, white eye-ring; bill is orange, black spot near tip. Wings are short with white-bordered or spotted black tips. The legs are red-orange. Strong direct flight with deep wing beats. Soars on thermals and updrafts.
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Glaucous Gull: Large, white gull with pale gray back. Eyes are yellow. Bill is yellow with red spot on lower mandible. Wings are white-edged and white tipped. Legs and feet are pink. An active predator of seabird nesting colonies. Slow, steady wing beats. Soars on thermals and updrafts.
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Gull-billed Tern: Lightest North American tern. Black cap that extends below eyes, down nape; pale gray upperparts that are darker at the wingtips; short, stout black bill and black legs, feet; long wings with very long outer primaries. Direct flight with graceful, shallow wing beats.
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Herring Gull: Large gull, pale gray back and wings with black tips, white head, neck breast. White tail and underparts. Bill is yellow with red spot near tip; legs are pink. Strong steady flight with deep wing beats. Soars on thermals and updrafts. Most widespread North American Gull.
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Iceland Gull: Large, white gull, pale, pearl-gray back and upper wings. Bill is yellow, red spot at tip of lower mandible. Wing tips sometimes marked with pale to dark gray. White tail; legs and feet are pink. Direct flight with strong deep wing beats. Soars on thermals and updrafts.
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Laughing Gull: Medium gull, gray back, white underparts. Head has black hood, neck is white, and bill is red. Wings are gray and white-edged and black at tips; tail is white. Legs and feet are black. Slow flight with deep wing beats. Soars on updrafts. Named for its laughterlike call.
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Least Tern: Small tern, slate-gray upperparts, white underparts. Crown, nape are black and forehead is white. Black leading edge of outer wing conspicuous in flight. Tail is forked. Bill and feet are yellow. Fast smooth flight with rapid wing beats. Hovers briefly before dipping down to sieze prey.
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Lesser Black-backed Gull: Medium-sized gull with dark gray back and wings. Head, neck and underparts are white. Rump and tail are white. Bill is yellow with red spot near tip. The wings have dark tips with white spots; legs and feet are yellow. Eyes are yellow with red orbital rings.
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Little Gull: The smallest of all gulls, with pale gray upperparts and white nape, neck, breast, belly, and tail. Hood is black and extends onto upper neck. Underwings are dark. Bill is dark red with black tip. Legs and feet are red-orange. Strong direct flight with deep wing beats.
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Ring-billed Gull: Medium gull with gray upperparts and white underparts. Head is white and bill is yellow with black ring near tip. Wings are gray above, tipped black with white spots, and white below. Yellow legs and feet. Strong direct flight on deep wing beats, soars on thermals.
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Roseate Tern: White below with slight, variable pinkish cast visible in good light; pale gray above with black cap, nape and deeply forked tail that projects well beyond wingtips at rest. Bill mostly black with some red at base; legs and feet are red-orange. Graceful, direct flight.
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Royal Tern: Large tern, pale gray upperparts; white face, neck, and underparts. Head has spiky, black crest and cap, and heavy, bright orange bill. Wings are black-tipped above and black-edged below; tail is deeply forked. Legs and feet are black. Hovers before plunge diving for prey.
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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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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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Long-tailed Jaeger: Small jaeger with gray upperparts, white breast, gray belly. Black cap covers eyes, crosses chin and ends at yellow nape. Upperwings are dark-edged. Tail is gray with black edges and long, black streamers. Legs are blue-gray and toes are webbed. Hovers before dipping for prey.
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