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Cats in the United States : ウィキペディア英語版 | Cats in the United States
Many different species of mammal can be classified as cats (felids) in the United States. These include domestic cat (both house cats and feral), of the species ''Felis catus''; medium-sized wild cats from the genus ''Lynx''; and big cats from the genera ''Puma'' and ''Panthera''. Domestic cats vastly outnumber wild cats in the United States. ==Prehistoric cats== At least 67 species of saber-toothed cat existed in North America between 42 million and 11 thousand years ago before going extinct. Their disappearance can be attributed to both the changing climate at the end of the Ice Age and the appearance of humans in the Americas. Some prehistoric animals referred to as "saber-toothed cats" were in fact marsupials and not cats at all, but called such because of their resemblance to true felines with large canine teeth.
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