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The brown skua (''Stercorarius antarcticus''), also known as the Antarctic skua, subantarctic skua, southern great skua, southern skua, or hākoakoa (Māori), is a large seabird that breeds in the subantarctic and Antarctic zones and moves further north when not breeding. Its taxonomy is highly complex and a matter of dispute, with some splitting it into two or three species: Falkland skua (''S. antarcticus''), Tristan skua (''S. hamiltoni''), and subantarctic skua (''S. lönnbergi''). To further confuse, it hybridizes with both the south polar and Chilean skuas, and the entire group has been considered to be a subspecies of the great skua, a species otherwise restricted to the Northern Hemisphere. It feeds on fish (often via kleptoparasitism), other birds, small mammals, eggs and carrion. This is the heaviest species of skua and rivals the largest gulls, the great black-backed gull and glaucous gull, as the heaviest species in the shorebird order although not as large in length or wingspan. It is in length, in wingspan and has a body mass of .〔(HBW 3 - Species accounts: Brown Skua ) (2011).〕〔''CRC Handbook of Avian Body Masses'' by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.〕 ''S. a. hamiltoni'' measured on Gough Island, weighed an average of in 9 males and in 9 females. ''S. a. lönnbergi'' measured in the Chatham Islands weighed an average of in 30 males and an average of in 32 females. The latter is the highest colony mean body mass for any living species of shorebird.〔''CRC Handbook of Avian Body Masses, 2nd Edition'' by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.〕 == References == * * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brown skua」の詳細全文を読む スポンサード リンク
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