MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Thylacosmilus, illustration. This extinct prehistoric mammal was a sabre-toothed metatherian (marsupial). Its fossils are found in Argentina in South America. It lived between 9 and 3 million years ago during the Late Miocene and Pliocene. A powerful predator, it was similar in size to a jaguar.
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