General

Cory's Shearwater: Large gray-brown shearwater with white underparts and pale yellow bill. Best identified by its relatively slow, languid flight compared to other shearwaters. Sexes are similar; juvenile resembles adult.

Range and Habitat

Cory's Shearwater: Breeds on the Azores and in the Mediterranean, but roams widely all over the Atlantic Ocean during the nonbreeding season.

Breeding and Nesting

Cory's Shearwater: Nests in colonies in burrows, cracks, and crevices on ocean islands. Lays one egg that is incubated for about 54 days, with parents alternating their incubation roles about every 6 days. Chick takes first flight when 97 days old.

Foraging and Feeding

Cory's Shearwater: Mainly feeds at night, plunging into the ocean or picking from the surface to catch fish, squid, and crustaceans.

Vocalization

Cory's Shearwater: Generally silent when at sea.

Similar Species

Cory's Shearwater: Greater Shearwater has a more contrasting look, including a dark cap and white collar. Bill is black.