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Puffin Fratercula arctica L 30cm. Endearing seabird. Flies on narrow wings with whirring wingbeats. Swims well and dive frequently for fish. Sexes are similar. Adult in summer has mainly dark upperparts with dusky face; underparts are white. Legs are orange-red and bill is huge, flattened and marked with red, blue and yellow. In winter, similar but with dark grey face and smaller, duller bill. Juvenile is similar to winter adult but with small, dark and dull bill. Voice Utters groaning calls at nest. Status Locally common. Only comes ashore in breeding season. Colonial nester, excavating burrows in grassy cliffs. Only storm-driven, sick or oiled birds are seen near land in winter.