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The gadwall (''Anas strepera'') is a common and widespread duck of the family Anatidae. ==Systematics== The gadwall was first described by Linnaeus in 1758 in his ''Systema naturae'', under its current scientific name.〔 DNA studies have shown that it is a sister species with the falcated duck, and that these two are closely related to the wigeons.〔 There two subspecies:〔 * ''A. s. strepera'', described by Linnaeus, is the nominate subspecies. * ''A. s. couesi'', Coues' gadwall, extinct circa 1874, was formerly found on Teraina, a coral atoll in the Pacific Ocean.〔 The etymology of the word ''gadwall'' is not known, but the name has been in use since 1666.〔 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「gadwall」の詳細全文を読む スポンサード リンク
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