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List of endangered and threatened mammals

Keiko the killer whale, star of the "Free Willy" movies, swims in his tank at the Oregon Coast Aquarium in Newport, Ore., in this Jan. 22, 1998, file photo. The 6-ton whale, who died in a Norwegian fjord where his team was trying to reintroduce him to the wild was buried in a snowbound pasture in December 2003, just yards from where he died. The killer whale is on the list of endangered species. AP photo by Jack Smith