Abstract
Breeding synchrony of Cory's Shearwater was assessed by comparing the tarsus‐lengths of neighbouring chicks. Chicks were closer in size when they were less than 3 m apart than when they were 30 or 60 m apart. Nearest neighbours were more highly synchronized to each other than they were to their second or third nearest neighbours. It is suggested that where nests are widely spaced, shearwaters may synchronize very closely with their nearest neighbour. Where nesting is dense, an average synchrony, with a number of pairs, may be attempted. A likely advantage of synchronous breeding is a reduction in predation by gulls.
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