Menoceras is an extinct pig-sized rhinoceros that roamed the plains of the North American mid-west during the lower Miocene Epoch. Because of the massive accumulations of fossil bones of this animal, particularly at Agate Springs Nebraska, it seems safe to assume that they lived and died in large herds.

Male Menoceras sported two horns side by side at the tip of the nose, whereas the females had no horns. All other rhino genera have their horns arranged one behind the other.

Prehistoric rhinos | Miocene mammals | Miocene extinctions