Skomer Island, lying off the south-western tip of the rocky Pembrokeshire coast, has long been recognised as an important breeding site for Manx Shearwaters Puffinus puffinus. The breeding biology and winter migrations of this species are now well known (Lockley 1942, Harris 1966a, b, Perrins et al. 1973). Two attempts have been made to census the breeding population on the neighbouring island of
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