MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Thoatherium, illustration. This extinct prehistoric mammal is an example of a litoptern, ungulates that evolved in South America. Thoatherium lived from 17.5 to 16.3 million years ago, during the Early Miocene. It reached a body length of around 70 centimetres, and is thought to have been similar to a gazelle. Its fossils have been found in Argentina.
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