Cory's Shearwater

Calonectris diomedea

Order

PROCELLARIIFORMES

Family

Petrels and Shearwaters (Procellariidae)

Code 4

COSH

Code 6

CALDIO

ITIS

Egg Color:

White



Number of Eggs:

1



Incubation Days:

54



Egg Incubator:

Both sexes



Nest Location:

In burrow or rock crevices.



Nest Material:

None



Migration:

Migratory



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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 cliffs in the Mediterranean, with the odd outpost on the Atlantic coast of Iberia. Most birds migrate into the Atlantic as far north as the south-western coasts of Great Britain and Ireland. They return to the Mediterranean in February. The biggest colony is located in Savage Islands, Madeira.

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.

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UnderpartsX

Belly, undertail coverts, chest, flanks, and foreneck.

Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X