Thylacosmilus atrox is an extinct species of saber-toothed metatherian that inhabited South America from the late Miocene to Piacenziane. Though Thylacosmilus is one of several predatory mammal genera typically called “saber-toothed cats”, it was not a felid, but a sparassodont, a group closely related to marsupials, and only superficially resembled other saber-toothed mammals due to convergent evolution. Based on studies of its habitat, Thylacosmilus is believed to have hunted in savannah-like or sparsely forested areas.
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