SIRS,--I am grateful to Mr. Ivan M. Goodbody for his comments (antea, p. 32) on my paper on the nocturnal migration of thrushes (antea, vol. xlvi, pp. 37°-374)' It is indeed possible that the coasting movement at Dun Laoghaire was unnatural. With the complete lack of similar observation for comparison, one cannot decide. But I would like to suggest that the plausibility of the hypothesis he advanc...
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