This quite striking bird probably didn't immediately 'click' - it certainly didn't with me! It is obviously a tern, and it does not look large. But which one has such a bold pattern? The relatively large head, large eye and bulky wing do not suggest a marsh tern Chlidonias, and in any case the contrasted blackish lesser coverts forming the carpal bar indicate a sea tern Sterna in an immature or a

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