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Concept
Albatros à queue courte
Résumé
The short-tailed albatross or Steller's albatross (Phoebastria albatrus) is a large rare seabird from the North Pacific. Although related to the other North Pacific albatrosses, it also exhibits behavioural and morphological links to the albatrosses of the Southern Ocean. It was described by the German naturalist Peter Simon Pallas from skins collected by Georg Wilhelm Steller (after whom its other common name is derived). Once common, it was brought to the edge of extinction by the trade in feathers, but with protection efforts underway since the 1950s, the species is in the process of recovering with an increasing population trend. Its breeding range, however, remains small. It is divided into two distinct subpopulations, one of which breeds on Tori-shima in the Izu islands south of Japan, and the other primarily on the Senkaku Islands in the East China Sea.
The short-tailed albatross is a medium-sized albatross, with a wingspan of , a length of and a body weight that can be . Among standard measurements, the bill is long, the tail is long, the tarsus around and the wing chord . Its plumage as an adult is overall white with black flight feathers, some coverts, as well as a black terminal bar on its tail. It has a yellow-stained nape and crown. Its bill is large and pink; however, older birds will gain a blue tip. The juveniles are an all-over brown colour, and they will whiten as they mature, in about 10 to 20 years. It can be distinguished from the other two species of albatross in its range, the Laysan albatross and the black-footed albatross by its larger size and its pink bill (with a bluish tip), as well as details of its plumage. Contrary to its name its tail is no shorter than that of the Laysan or black-footed, and is actually longer than that of the other member of the genus Phoebastria, the waved albatross.
Short-tailed albatrosses now nest on four islands, with the majority of birds nesting on Tori-shima, and almost all of the rest on Minami-kojima in the Senkaku Islands.
Source officielle
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