Researchers in Florida have identified a new genus and species of saber-tooth cat that's related to the well-known Smilodon fatalis. A collection of 5-million-year-old fossils led to the identification of the big cat, which is believed to have evolved in North America. "When people think of saber-toothed cats, they think of it as just one thing, as if the famous tar pit saber-toothed cat was the only species, when in fact, it was an almost worldwide radiation of cats that lasted over 10 million years and probably had a total of about 20 valid species," said Richard Hulbert of the University of Florida.

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