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Skuas

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Skuas

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Skuas
Pomarine Skua
 
Pomarine Skua
Scientific classification
Kingdom: Animalia
 
Phylum: Chordata
 
Class: Aves
 
Order: Charadriiformes
 
Family: Stercorariidae
Gray, 1871
Genus: Stercorarius
Brisson, 1760

The skuas are seabirds in the family Stercorariidae. The three smaller skuas are called jaegers in North America.

The name skua comes from Faroese skgvur [ˈsgɪgvʊɹ] (Stercorarius skua), and the island of Skvoy is renown for its colony of that bird. Jaeger is derived from the German word Jger, meaning hunter.

Skuas nest on the ground in temperate and arctic regions and are long-distance migrants.

Outside the breeding season they take fish, offal and carrion. Many are partial kleptoparasites, chasing gulls, terns and other seabirds to steal their catches; the larger species also regularly kill and eat adult birds, up to the size of Great Black-backed Gulls. On the breeding grounds they commonly eat lemmings, and the eggs and young of other birds.

They are in general medium to large birds, typically with grey or brown plumage, often with white markings on the wings. They have longish bills with a hooked tip, and webbed feet with sharp claws. They look like large dark gulls, but have a fleshy cere above the upper mandible. They are strong, acrobatic fliers.

Skua in Antarctica
Skua in Antarctica

Skuas are related to gulls, waders, auks and skimmers. In the three smaller species (all Holarctic), breeding adults have the two central tail feathers obviously elongated and at least some adults have white on the underparts and pale yellow on the neck, characteristics that the larger species (all native to the Southern Hemisphere except for the Great Skua) do not share. Therefore the skuas are often split into two genera with only the smaller species retained in Stercorarius, and the large species placed in Catharacta. However, there is no genetic basis for this separation. The Pomarine and Great Skuas' mitochondrial DNA (which is inherited from the mother only) is in fact more closely related to each other than it is to either Arctic or Long-tailed Skuas, or to the Southern Hemisphere species. Thus, hybridization must have played a considerable role in the evolution of the diversity of Northern Hemisphere skuas.

"Skua" is also a slang term at American Antarctic research stations such as the McMurdo Station or the Amundsen-Scott South Pole Station. It is named for the bird, and it means to salvage or scavenge for equipment or gear.

Species

  • Long-tailed Skua or Long-tailed Jaeger, Stercorarius longicaudus
    Arctic Skua or Parasitic Jaeger, Stercorarius parasiticus
    Pomarine Skua or Pomarine Jaeger, Stercorarius pomarinus
    Chilean Skua, Stercorarius chilensis
    South Polar Skua, Stercorarius maccormicki
    Brown Skua, Stercorarius antarctica
    Great Skua Stercorarius skua

Reference

  • Seabirds by Harrison, ISBN 0-7470-1410-8

External links


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Birds Guide, made by MultiMedia | Free content and software

This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.


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