CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Brontotheres. Artist's impression of two Brontotheres (Brontotherium sp.), extinct mammals that lived during the Eocene epoch, 58-30 million years ago. Brontotheres belong to the same group as horses, rhinos and tapirs, although they most resemble modern-day rhinoceroses. These herbivores evolved to huge body sizes, up to 2.5 metres in height. Their heads were often adorned with horns and bony protrusions.
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