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Great skua
The great skua (''Stercorarius skua'') is a large seabird in the skua family Stercorariidae. The name skua is believed to originate from the Faroese ''skúvur'' and is the only known bird name to originate from the Faroes that has come into regular use elsewhere.〔Salomonsen, F. (1935). Den færøiske ornithologis historie indtil aar 1800 supplement. Dansk Ornithologisk Forenings Tidsskrift, 67–100.〕 In Britain, it is sometimes known by the name bonxie, a Shetland name of Norse origin.〔Dictionary of the Scots Language. http://www.dsl.ac.uk/entry/snd/bonxie〕
==Description==
This is a large skua, measuring long with a wingspan. One study found that 112 males weighed an average of and that 125 females weighed an average of .〔''CRC Handbook of Avian Body Masses, 2nd Edition.'' John B. Dunning Jr. (Editor). CRC Press (2008). ISBN 978-1-4200-6444-5.〕 The adult is streaked greyish brown, with a black cap, while the juvenile is a warmer brown and unstreaked below. Its tail is short and blunt. The flight is direct and powerful. The brown skua's call is a harsh ''hah-hah-hah-hah''; quacking and croaking noises have also been heard. Distinguishing this skua from the other North Atlantic skuas (Arctic skua, pomarine skua and long-tailed skua) is relatively straightforward. The herring gull size, massive barrel chest and white wing flashes of this bird are distinctive even at a distance. It is sometimes said to give the impression of a common buzzard (which in America would be called a hawk). Identification of this skua is only complicated when it is necessary to distinguish it from the closely related large southern-hemisphere skuas. Despite its name, the great skua is marginally smaller on average than the other 3 large southern-hemisphere skuas, although not by enough to distinguish them by size in the field.〔 Some authorities still regard the great skua as conspecific with some of these southern skuas, and as a group they have sometimes been separated in the genus ''Catharacta'', although currently this is not commonly followed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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