Last month's mystery bird (plate 67. repeated here) is obviously an immature gull, and all the 'black-headed', 'black-backed' or 'white-winged' gulls can be quickly eliminated. It is obviously either a Herring Gull Larus argentatus, a Common Gull L. canus, or a vagrant Ring-billed Gull L. delawarensis. Unfortunately, it is on its own; but even without another species with which to make comparison, i

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