EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An artistic 3D rendering of Brontotherium, an extinct prehistoric North American mammal which existed during the late Eocene epoch, roughly 38 million years ago. Brontotherium (also known as Megacerops) resembled a large rhinoceros, measuring about 8 feet high and 16 feet long, with a distinct Y-shaped horn which was more prominent in males. Despite its appearance, Brontotherium was more closely related to prehistoric horses as a perissodactyl (odd-toed ungulate).
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