CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Uintatherium. Artist's impression of two Uintatherium (Uintatherium robustum), extinct mammals that lived during the Eocene epoch, 52-36 million years ago. They belong to the same group as horses, rhinos and tapirs, although they most resemble modern-day rhinoceroses, or elephants. These herbivores evolved to huge body sizes, up to 1.6 metres high at the shoulder, and 4 metres long. Their heads were adorned with six bony protrusions and their upper jaws grew a pair large dagger-like tusks.
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