What is a British bird ? Sirs,--The recent note and subsequent correspondence on the occurrence of a White-throated Sparrow (Zonotrichia albkollis) in Hampshire {Brit. Birds, 54: 366-367 and 439-440) prompts once more the question: what is a British bird? I do not oppose the decision to regard shipassisted passage as a biological factor, but it seems to me difficult, if not impossible, to make dis...

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