|They make no nest. A single egg is incubated
on bare rocks.
Small schooling fish 200 mm long or less, such
as polar cod,
capelin, sand lances, sprats, sandeels, Atlantic
cod and Atlantic herring.
Black on the head, back and wings,
with white underparts. It has a thin dark pointed bill and
a small rounded dark tail. After the breeding moult,
face is white with a dark spur behind the eye. Some birds have a white eye ring, extending back as a line
These are known as bridled
May and July for the Atlantic populations
March to July for those in the Pacific.
Various colours and patterns to help parents recognise their
egg in large breeding colonies.