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But if woolly mammoths have been extinct for so long, how do we know so much about them? Well, as it happens, frigid temperatures preserved the carcasses of certain members of the species, with these sets of remains then being uncovered in more recent times. Owing to these remnants, then, we know what woolly mammoths look like and what they ate. We even know how prehistoric humans interacted with the giant mammals from cave paintings.