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The Chiloé wigeon (''Anas sibilatrix''), also known as the southern wigeon, is one of three extant species of wigeon in the genus ''Anas'' of the dabbling duck subfamily. This bird is indigenous to the southern part of South America, including the Chiloé Archipelago. In its native range, it is called the ("piebald duck") or ("royal duck"), although the latter name also refers to the Muscovy in the wild. Its specific epithet, ''sibilatrix'', means 'whistler', referring to the bird's call. ==Description== The Chiloé wigeon has a body length of and a wingspan of . The wing length is about and the weight is approximately . This bird has an iridescent green-blue cap on its head, and a bluish gray bill with a black tip. The cheeks and forehead are white, the eyes are dark brown, and there is a white auricular patch. The neck and occipital part of the head are black. The breast is barred black and white and the plumage of the wings is gray and white. The flanks of males are rust colored, and light brown on females. The legs and feet are gray. Sexual dimorphism is relatively subtle in this species of wigeon. Males are usually somewhat larger and heavier, and with somewhat brighter plumage and more strongly pronounced iridescence of the cap. Apart from these features, it can be difficult to distinguish the two sexes.〔Shirihai H: ''A Complete Guide to Antarctic Wildlife - The Birds and Marine Mammals of the Antarctic Continent and Southern Ocean'', Alula Press, Degerby 2002, p. 247. ISBN 951-98947-0-5〕 Juveniles resemble adult birds, but the rust coloring on the flanks is diminished or even absent. 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「Chiloé wigeon」の詳細全文を読む スポンサード リンク
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