Calonectris
Encyclopedia
Calonectris is a genus of seabird
Seabird
Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...

s. It comprises three large shearwater
Shearwater
Shearwaters are medium-sized long-winged seabirds. There are more than 30 species of shearwaters, a few larger ones in the genus Calonectris and many smaller species in the genus Puffinus...

s. There are two other shearwater genera. Puffinus
Puffinus
Puffinus is a genus of seabirds in the order Procellariiformes. It comprises about 20 small to medium-sized shearwaters. There are two other shearwater genera: Calonectris, which comprises three large shearwaters, and Procellaria with another four large species...

, which comprises about twenty small to medium-sized shearwaters, and Procellaria
Procellaria
Procellaria is a genus of southern ocean long-winged seabirds related to prions and a member of the Procellariiformes order.-Taxonomy:Procellaria is a member of the family Procellariidae and the order procellariiformes. As members of Procellariiformes, they share certain characteristics. First they...

 
with another four large species. The latter are usually named as petrels, although they are thought to be more closely related to the shearwaters than to the other petrel
Petrel
Petrels are tube-nosed seabirds in the bird order Procellariiformes. The common name does not indicate relationship beyond that point, as "petrels" occur in three of the four families within that group...

s.

The taxonomy of this group is the cause of some debate, and it is only recently that the Cape Verde Shearwater
Cape Verde Shearwater
The Cape Verde Shearwater , or Cagarra locally, is a medium-large shearwater, a seabird in the petrel family Procellariidae. It is a breeding endemic of the Cape Verde archipelago of Macaronesia in the Atlantic Ocean, off the coast of West Africa.-Taxonomy:The Cape Verde Shearwater was originally...

 has been split from Cory's Shearwater
Cory's Shearwater
The Cory's Shearwater 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,...

.

The species in this group are long-winged birds, dark brown or grey-brown above, and mainly white below. They are pelagic outside the breeding season. They are most common in temperate and cold waters.

These tubenose
Tubenose
Tubenose may refer to:* Birds in the order Procellariiformes.* Fishes in the family Aulorhynchidae....

 bird
Bird
Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

s fly with stiff wings, and use a shearing flight technique to move across wave fronts with the minimum of active flight. Their flight appears more albatross-like
Albatross
Albatrosses, of the biological family Diomedeidae, are large seabirds allied to the procellariids, storm-petrels and diving-petrels in the order Procellariiformes . They range widely in the Southern Ocean and the North Pacific...

 than the Puffinus species.

Calonectris shearwaters are long-distance migrants
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

. Streaked Shearwater disperses from its east Asia
Asia
Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...

n breeding islands throughout the western Pacific and into the eastern Indian Ocean
Indian Ocean
The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

.

Cory's has two subspecies. C. d. diomedea breeds in the Mediterranean and C. d. borealis on the Azores
Azores
The Archipelago of the Azores is composed of nine volcanic islands situated in the middle of the North Atlantic Ocean, and is located about west from Lisbon and about east from the east coast of North America. The islands, and their economic exclusion zone, form the Autonomous Region of the...

, the Canary Islands
Canary Islands
The Canary Islands , also known as the Canaries , is a Spanish archipelago located just off the northwest coast of mainland Africa, 100 km west of the border between Morocco and the Western Sahara. The Canaries are a Spanish autonomous community and an outermost region of the European Union...

 and Madeira
Madeira
Madeira is a Portuguese archipelago that lies between and , just under 400 km north of Tenerife, Canary Islands, in the north Atlantic Ocean and an outermost region of the European Union...

. It disperses throughout the Atlantic Ocean
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

 and into the western Indian Ocean. These may be distinct species (Heidrich et al. 1998).

Calonectris shearwaters come to islands and coastal cliffs only to breed. They are nocturnal at the colonial breeding sites, preferring moonless nights to minimise predation. They nest in burrows and often give eerie contact calls on their nighttime visits. They lay a single white egg.

They feed on fish, squid and similar oceanic food. They will follow fishing boats to take scraps.

List of species

  • Genus Calonectris
    • Streaked Shearwater
      Streaked Shearwater
      The Streaked Shearwater, Calonectris leucomelas is a species of seabird. The bird is 48 cm in size, with a 122 cm wingspan. This species is pelagic, but also occurs in inshore waters. It occurs in the Pacific Ocean, nesting in Japan and many of its offshore islands. After breeding, the Streaked...

      , C. leucomelas
    • Cory's Shearwater
      Cory's Shearwater
      The Cory's Shearwater 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,...

      , C. (diomedea) borealis
      • Scopoli's Shearwater, C. (diomedea) diomedea
    • Cape Verde Shearwater
      Cape Verde Shearwater
      The Cape Verde Shearwater , or Cagarra locally, is a medium-large shearwater, a seabird in the petrel family Procellariidae. It is a breeding endemic of the Cape Verde archipelago of Macaronesia in the Atlantic Ocean, off the coast of West Africa.-Taxonomy:The Cape Verde Shearwater was originally...

      , C. edwardsii


Two prehistoric species, Calonectris krantzi from the Early Pliocene and Calonectris wingatei from the Middle Pleistocene
Middle Pleistocene
The Middle Pleistocene, more specifically referred to as the Ionian stage, is a period of geologic time from ca. 781 to 126 thousand years ago....

, have also been described from fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

s.
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