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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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Greater Shearwater: Large shearwater, scaled, gray-brown upperparts, white underparts, brown markings on belly. Dark cap contrasts with white face. Tail is dark above with conspicuous white rump band and gray below. Dark, hooked bill. Pink legs, feet. Flies on deep wing beats followed by long glide.
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Manx Shearwater: Small shearwater with brown-black upperparts and white underparts, underwings and undertail coverts. Black cap is darker than back. The bill is dark. Wings are long, slim, and straight. Tail is short and pointed. Feeds on fish and squid. Alternates long glides and rapid wing beats.
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Wilson's Storm-Petrel: Small storm-petrel, mostly brown-black body, pale brown wing bands, large, conspicuous white rump. Wings are short and rounded. Feet extend past tail in flight. Smallest and most commonly seen storm-petrel off the Atlantic Coast. Direct flight with steady, shallow wing beats.
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Leach's Storm-Petrel: Medium storm-petrel with dark brown body and white rump and undertail feathers. Wings are dark with pale gray-brown bar on upperwings. Long tail is dark and forked. Bill, legs, and feet are black. Its flight is bounding and erratic, with frequent changes of direction and speed.
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Parasitic Jaeger Dark Morph: Medium jaeger with brown body, darker cap, and pale underwing patches near tips. Pale form has white underparts with brown breast band; intermediates between dark and light morphs occur. Diamond-shaped tail has elongated, pointed central feathers. Black bill, legs, feet.
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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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