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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Blue-billed duck ： ウィキペディア英語版 Blue-billed duck The blue-billed duck (''Oxyura australis'') is a small Australian stiff-tailed duck, with both the male and female growing to a length of 40 cm (16 in). The male has a slate-blue bill which changes to bright-blue during the breeding season, hence the duck’s common name (see photo). The male has deep chestnut plumage during breeding season, reverting to a dark grey. The female retains black plumage with brown tips all year round. The duck is endemic to Australia's temperate regions, inhabiting natural inland wetlands and also artificial wetlands such as sewage ponds in large numbers. It can be difficult to observe due to its cryptic nature during its breeding season through autumn and winter. The male duck exhibits a complex mating ritual. The blue-billed duck is omnivorous, with a preference for small aquatic invertebrates. BirdLife International〔 has classified this species as Near Threatened. Major threats include drainage of deep permanent wetlands, or their degradation as a result of introduced fish, peripheral cattle grazing, salinisation and lowering of ground water.〔(BirdLife Species Factsheet )〕 ==Taxonomy== The blue-billed duck was described in 1836 by ornithologist John Gould. The specific name ''australis'' is derived from the latin for "southern" and hence Australian, while the generic name is derived from the latin ''oxy-'' "sharp" and ''ura'' "tail". 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「Blue-billed duck」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.