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 | | Taxonomy followed by AOU (1998) is used here, including that proposed by Livezey (1991) for the tribe Anatini, suface-feeding, or dabbling, ducks, with some modifications as indicated within species accounts. |
 | | Subfamiles are Dendrocygninae Whistling-ducks, Anserinae Geese and Swans (including tribes Anserini True Geese and Cygnini Swans), Tadorninae Shelducks, and Anatinae True Ducks (including tribes Anatini Surface-feeding ducks, Aythyini Pochards, Mergini Sea-ducks and Mergansers, and Oxyurini Stiff-tailed ducks). |
 | | This species and the next 3 were considered distinct from the remaining members of Anas based on plumage and structural characters and assigned to the genus Mareca by Livezey (1991). |
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