MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Syndyoceras, illustration. This extinct prehistoric mammal has distinctive forked nasal horns. It is an example of a protoceratid, an animal resembling but not related to deers. Syndyoceras lived from 25 to 20 million years ago, during the Miocene. It reached a body length of around 1.6 metres. Its fossils have been found in North America.
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