The New Zealand stiff-tailed duck (Oxyura vantetsi) is an extinct duck species from New Zealand which is known only from subfossil remains. It was first described as a distinct species by Trevor H. Worthy in 2005. The New Zealand stiff-tailed duck was closely related to the Australian blue-billed duck (Oxyura australis) but its bones were about one tenth smaller than those of its Australian relative.
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