Marine & pelagic, showing marked preference waters around Subtropical Convergence. Nests on densely forested slopes or on cliffs or stacks.
"Birds arrive at all colonies around 10 Sept;...laying begins 26 Nov ends 30 Nov;most fledglings gone mid-late May."(HANZAB,1,p.607)
Transequatorial migrant.Most birds move north to winter in subarctic waters of Pacific. Subsequently they move south down the west coast of North America, with large numbers southern California in August.Some birds,probably mostly immatures, spend the breeding season in winter quarters,ranging south to Chile.