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Chatham duck
The Chatham duck or Chatham Island duck (''Pachyanas chathamica'') is an extinct species of duck, in the monotypic genus ''Pachyanas'', which once lived in New Zealand’s Chatham Islands in the south-west Pacific Ocean. It was described by Walter Oliver (as a "stoutly built duck") from bird bones in the collection of the Canterbury Museum in 1955 in the second edition of his work ''New Zealand Birds''. Recently, analysis of mitochondrial DNA extracted from subfossil remains has shown that the Chatham duck was not, in fact, closely related to shelducks but instead belongs in the genus Anas: the dabbling ducks. Its closest living relatives appear to be the Auckland teal, Campbell teal and the brown teal from New Zealand. Some authors have suggested that the Chatham duck was flightless; however, comparison of Chatham duck wing bones with those from living ducks indicates no disproportional reduction in wing length.〔 The Chatham duck likely became extinct in about the 16th century because of hunting by humans.〔
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==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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