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Arctic skua (Stercorarius parasiticus)

Arctic skua, Hornsund

Arctic skua

Description: The Arctic skua is a compact, medium-sized skua (length including tail feathers 46 cm, weight 350-600 g). It has a contrast-rich plumage with dark cap, white neck and belly and dark back and upper wings. The Arctic skua is often confused with the Pomarine skua and Long-tailed skua, although the latter two are much less common in Spitsbergen. The size and the shape of the tail are diagnostic. The Long-tailed skua is slightly smaller and more elegant in shape; the Arctic skua has a shorter tail than both Long-tailed skua and Pomarine skua.

As well as the “normal”, contrasty plumage, there is a dark morph with completely dark feathers. The dark morph is rare in Svalbard.

Distribution / Migrations: The Arctic skua breeds everywhere in the Arctic and sub-Arctic. In Svalbard, it breeds in tundra areas anywhere in the archipelago, but is most common on the west and north coasts of Spitsbergen. During the winter the open sea is their preferred habitat, usually off west and southwest Africa.

Biology: Single pairs of the Arctic skua breed on rather flat tundra, often on a very shallow rise in the ground for a good overview. Arctic skuas come to the breeding areas in early June, often returning to the same nest. After egg-laying in early July, both parents incubate the eggs (one or two) for 26 days. Soon after hatching, the young bird(s) leave the nest together with the parents. The family stays together until the chick can fly after about five weeks. As the Latin name suggests, Arctic skuas do not like to look for food themselves, but prefer to chase other birds such as Kittiwakes or Brünich’s Guillemots in flight until they drop their prey. Occasionally, they may also steal eggs or chicks from other birds. In areas where rodents occur, these are another welcome food source for the Arctic skua.

Miscellaneous: The Arctic skua is by far the most abundant skua in Svalbard, with an estimated local population of about 1,000 breeding pairs, and it is a common sight on flat tundra. Because of its good camouflage, it can be difficult to see. If you approach close to a nest, one of the adults will pretend to be hurt to lure you away. If you see this, then move away quickly either where you came from, or you can also follow the bird as it will lead you away from the nest. If you approach even closer, then the bird will attack. If this happens, move quickly away from the nest. Do not stop to take any photographs.

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last modification: 2014-10-27 · copyright: Rolf Stange
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