Slender, pointed wings, neat, black cap and forked tail clearly indicate an adult tern. The grey underparts, separated from the cap by a white streak, may initially suggest Whiskered Tern Chlidonias hybridus, but the underparts are too pale for a summer adult and too uniform for one in transitional plumage; most obviously, however, the tail is much too long, too white and too deeply forked. T

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