JAIME CHIRINOS / SCIENCE PHOTO LIBRARY JAIME CHIRINOS / SCIENCE PHOTO LIBRARY
Illustration of Brontotherium hatcheri prehistoric mammals fighting. This large herbivorous odd-toed ungulate was found in what is now North America during the Late Eocene (38-34 million years ago). It had blunt y-shaped horns on its snout, which were much larger in males.
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