The Hawaiian Duck (Anas wyvilliana) is a species of bird in the family Anatidae. It is endemic to the large islands of Hawaiʻi.The former range of the Hawaiian Duck included all of the main Hawaiian islands except the island of Lānaʻi. Now the Hawaiian Duck only exists on the island of Kauaʻi. The Hawaiian Duck was extirpated on all other islands, but was subsequently reestablished on Oʻahu, Hawaiʻi, and Maui through release of captive-reared birds. However, all the Hawaiian Ducks in the reestablished populations have bred with feral Mallard ducks and have produced hybrid offspring (Griffin et al. 1989); consequently, "pure" Hawaiian Ducks are still only found on Kauaʻi.
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