MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Mesotherium, illustration. This extinct prehistoric mammal, similar in appearance to rodents, is classed as a type of hoofed animal known as a notoungulate. It lived from 1.2 million to 780,000 years ago, during the Middle Pleistocene. It was probably the size of a sheep. Its fossils are found in South America.
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