Cory's Shearwater

This species breeds on islands and cliffs in the Mediterranean, with the odd outpost on the Atlantic coast of Iberia. The nest is on open ground or among rocks or less often in a burrow where one white egg is laid, and is visited at night to minimise predation from large gulls. In late summer and autumn, 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.

Picture of the Cory's Shearwater has been licensed under a GFDL
Original source: Own work
Author: TomAllmendinger
Permission: GNU Free Documentation License

The Cory's Shearwater is classified as Least Concern. Does not qualify for a more at risk category. Widespread and abundant taxa are included in this category.

Cory's Shearwater but has since been separated again, by Cornelis Hazevoet in 1995, as a distinct species. Description - The Cape Verde Shearwater has a slim, dark bill, with head and upperparts darker than Cory's. The flight is more typically shearwater-like than Cory's, with stiffer and more rapid wing beats. The overall appearance, compared with Cory's, is of a smaller, slimmer and more angular bird. More

The Cory's Shearwater (Calonectris diomedea) is a large shearwater in the seabird family Procellariidae. This species breeds on islands and cliffs in the Mediterranean, with the odd outpost on the Atlantic coast of Iberia. The nest is on open ground or among rocks or less often in a burrow where one white egg is laid, and is visited at night to minimise predation from large gulls. More

The Cory's Shearwater has a large breeding range, estimated globally at between 50,000 and 100,000 square kilometers. It is native to North America, Europe, Africa, and many island nations. It prefers to live in marine ecosystems and often dwells in caves and other subterranean habitats. This bird has a global estimated population of 600,000 individuals that does not show signs of significant decline that would necessitate inclusion on the IUCN Red List. More

Cory's Shearwater (Calonectris diomedea borealis) 1) 62 seconds (975 KB) This sound scape of Cory's filled the air constantly! Calls of Madeiran S-p's is heard now and then throughout this recording. 2) 31 seconds (500 KB) Note the deeper and harsch voice of the female at the middle and end of the recording, as well as the calls of a Madeiran Storm-petrel at the end. 3) 13 seconds (208 KB) A male bird calling at nest. More

Cory's ShearwaterCalonectris diomedea WatchList 2007 Status: More

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. More

Cory's Shearwater : Uncommon (1-24% of trips. More

Cory's shearwaters fly with a slower, more relaxed wingbeat than do other shearwaters. FEEDING ECOLOGY AND DIET Feeds mainly at night on fish, squid, crustaceans, and offal by plunging and surface-seizing. Follows fishing boats. REPRODUCTIVE BIOLOGY Breeding season starts in April. Nests in natural nooks such as burrows or rock crevices. The single white egg is incubated for 54 days. The brown chicks are brooded for approximately four days, fledging after 97 days. More

Cory's Shearwater Calonectris diomedea = enlarge + Cory's Shearwater More

Cory's Shearwater (Calonectris diomedea) = Greek: Artemis = Cory's Shearwater (Calonectris diomedea) is a sea bird that you - don’t see it in Thassos any more in big numbers. You maybe - will see them following the ferry boats or bigger boats on the - open seas. On winter and spring the birds come out for nesting. More

Cory's Shearwater Calonectris diomedea borealis Scopoli Shearwater Calonectris d. diomedea Cape Verde Shearwater Calonectris edwardsii Cory's Shearwater photographed by Dave Larson Northern Hemisphere Breeders All forms of Cory's Shearwater including the Cape Verde Shearwater discussed below breed in Northern hemisphere. Thus they are working during our pelagic birding season in the summer. Birds seen on summer trips are probably non-breeders. More

Cory's shearwaters (Calonectris diomedea) tend to disperse and wander outside of the breeding season, with less specific feeding grounds. Habitat - Procellariids are marine; they come to land almost exclusively to breed. Behavior - Procellariids are excellent flyers, alternating flapping and dynamic soaring. Shearwaters are named for their ability to dip and glide between waves, just above the ocean surface. More

Cory's Shearwater (Calonectris diomedea) - Taxonomy - At least two subspecies: Calonectris d. diomedea - Scopoli's Shearwater Calonectris d. borealis - Cory's Shearwater The closely related Cape Verde Shearwater (C. edwardsii) is now generally treated as a distinct species. Arguments have also been put forward for splitting the remaining two races. More

Cape Verde Shearwater on right, Cory's Shearwater on left. The following images were taken by George Armistead. Great shot of Cape Verde Shearwater in flight. Notice the wing molt. Cape Verde Shearwater right in the center! Would you have picked this bird out? Cape Verde Shearwater on left, Cory's Shearwater on right. Cape Verde Shearwater on right, Cory's Shearwater on left. More

This may well be the first record of a Cory's Shearwater for the Pacific Ocean, or at least for the North Pacific. If anyone can update me on this, I would appreciate that information. Sea surface temps ranged from 58-60.8F in the area where we were following the Cory's Shearwater. I have been told that they often follow the edge of water temp breaks on the East Coast of the US. More

Picture of Calonectris diomedea above has been licensed under a Creative Commons Attribution-Share Alike.
Original source: TomAllmendinger
Author: TomAllmendinger
Permission: Some rights reserved
Order : Procellariiformes
Family : Procellariidae
Genus : Calonectris
Species : diomedea
Authority : (Scopoli, 1769)