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Cook's Petrel: This small petrel has a slate-gray back and upperwings marked by a black M-pattern, white underparts, under wings, and face with a small dark eye patch, black bill, blue-gray legs and feet, long slender wings, and a gray tail with black-tipped central feathers and white edges. It feeds mostly on fish and squid. Rapid and erratic flight. Sexes are similar.
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Cory's Shearwater: Large gray-brown shearwater, white underparts, pale yellow bill. Feeds at night on crustaceans and large sqiud it takes from the surface. Best identified by its relatively slow, languid flight compared to other shearwaters. Wings held downward. Soars on fixed wings if wind is up.
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Cape Verde Shearwater: Large seabird with gray-brown upperparts, dark brown flight feathers, and white underparts. Light pink bill is fairly long and thin with a dark ring near the slightly hooked tip. The wings are long and the tail is medium in length. Flies with rapid stiff wing beats alternated with short glides.
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Christmas Shearwater: This is a small to medium-sized bird with entirely black brown plumage that is slightly paler below. It has pale fringing to some of the feathers on the back and gray legs and feet. It has a short, narrow and slightly hooked black bill. In flight, alternates glides with rapid wing-beats. It feeds mainly on the larval forms of fish and squid. The sexes are similar.
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