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Length 45-51cm. Wingspan 102-112cm.
 Atlantic populations
Pale morph: back and rump silvery-grey, upperwings pale grey with darker primaries and carpal area and white bases to primaries forming a pale wing-patch, tail white. Head white with dark lores and underparts white. Underwing white with greyish primary tips and narrow trailing edge. Iris dark brown, short and heavy bill yellowish with bluish-grey base, legs greenish to flesh. Dark morph ("Blue Fulmar"): largely smoky-grey with darker carpal area and promaries but lacks pale patch, plumage wears to brownish; more numerous in subarctic seas. A wide range of intermediates between these two forms occurs.
 Pacific populations
Compared to Atlantic populations, differ in greater extremes between palest pale morph and darkest dark morph; upperpart feathering more mottled in appearance with dark speckles. Bill also marginally thinner than Atlantic birds.
In the North Pacific breeds on the coasts of eastern Siberia, Sakhalin, the Kurile and Commander Islands, Wrangel, Pribilof and St. Lawrence Islands and the Alaskan Peninsula. In North Atlantic breeds Baffin Island and Greenland, on Svalbard, Bear Island, and Franz Josef Land and perhaps Novaya Zemlya.
Further south breeds in Newfoundland, around the coasts of Iceland, the Faroes and British Isles. Smaller numbers breed on the German island of Heligoland, in Norway and north-west France and has recently bred in Denmark. Range has expanded greatly in Britain over the last century and there are now colonies on much of the east and south coasts where formerly absent.
Pacific birds winter south to Japan and California, rarely Baja California. Atlantic birds disperse from colonies and winter at sea from about 450N to the Arctic. A few may remain at some colonies throughout the year or visit during non-breeding period but most are at sea during September-March.
Three subspecies are currently accepted:
Pacific birds are genetically distinct from Atlantic birds, and have been proposed by some as a full species; conversely, others have suggested that F. g. auduboni should be considered a synonym of F. g. glacialis.
Breeds on rocky islands and mainland cliffs, sometimes in quarries or among rocks and ruined buildings some distance inland.
Pelagic when not breeding. Often attracted to fishing boats.
Breeds in large colonies from mid-May to late September on a bare rock ledge or in a slight depression in softer substrate. Single dull white egg incubated by both sexes for 55-57 days. Young fed by both parents, initially daily but later at longer intervals, leaves nest at 46-51 days.
Very long-lived, with ringed birds well over 50 years known.
Diet includes squid and fish, also offal from fishing and whaling vessels.
Voice is a harsh cackling at the nest and when quarrelling for food at sea.
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Paper describing genetic separation of Pacific from Atlantic Northern Fulmar
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