Pelagic seabirds and marine predators. Some older readers of this journal must have experienced, as I did, a feeling of deja vu on reading the letter by Halle (1991) in which he wondered how seabirds survive the attentions of underwater predators when they have to roost or rest on the sea, for he had published an almost identical query 20 years before (Halle 1971). There is, of course, no unitary

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