April 1979 – vol. 72, issue 4, pp 182–183 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... This article is only available to registered users.To read more, please log in or purchase a subscription.