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Manx Shearwater Puffinus puffinus W 70-85cm. Skims low over sea on stiffly held wings. Contrasting dark upperparts and mainly white underparts are seen as bird banks and glides. Gregarious when feeding is good. Sexes are similar. Adult has blackish upperparts and mainly white underparts with dark wing margins. Juvenile is similar to adult. Voice Silent at sea; strangled coughing calls uttered after dark when nesting birds. Status Fairly common summer visitor. Seen mostly at sea; only visits land to breed, after dark. Nests in burrows on remote islands.