The white-necked petrel (Pterodroma cervicalis) is a seabird in the family Procellariidae; adults measure some 43 centimetres (17 in) in length, with a wingspan of 95–105 centimetres (37–41 in). Although the species is found in much of the South Pacific, it breeds on only three islands and is thus considered vulnerable by the IUCN.Photograph: JJ Harrison
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