Last month's mystery photograph (colour plate 31, repeated here in black-and-white) was obviously a sea tern Sterna. No gull (Laridae) has the long-headed, long-billed appearance or crested rear crown shown by this bird. The thick, long bill with obvious gonydeal angle and the generally heavy build would have brought most readers to the conclusion that it is one of the five 'orange-billed' large
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