|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,
cod and Atlantic herring.
Black on the head, back and wings,
underparts. It has a thin dark pointed bill and
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
egg in large breeding colonies.