A seabird with dark upper wings and white undersides. It breeds on islands off the UK and migrates to the South American coast for winter.
Its slim, straight wings are black above and white below. It flies low over the sea with rapid stiff-winged flaps followed by long glides.
It breeds in groups on islands off the UK. It leaves its nesting sites around July for the South American coast and returns in late February and March.
An extinction-risk assessment has not been added yet.