With really good views there is no problem in separating Bridled Sterna anaethetus and Sooty Terns S. fuscata. Only one other species comes into the reckoning: in view of the recent addition of Aleutian Tern S. aleutica to the western Palearctic list, consideration must be given to the Spectacled Tern S. lunata of the central South Pacific. I have no experience of this species, however, and t
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