SLATY-BACKED GULL Larus schistisagus

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Bearing a superficial resemblance to a large Lesser Black-backed Gull, the plumage of this bird is variable due to bleaching. This is because it breeds primarily on Asiatic coasts of the North Pacific and is often in areas of long daylight hours in summer. It winters south to Japan, which is probably the easiest place to see it, although vagrants occur in western USA, and one has recently been claimed in Britain, having been long expected.

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