Caption:
An Oligocene Brontotherium leaves his forest habitat in search of a vegetarian meal. 35 million years ago North America was home to brontotheres, a family of large herbivores that looked somewhat like giant rhinoceroses, but probably were more closely related to horses. Brontotherium ('thunder beast') was one such genus of these prehistoric mammals. Characterized by a massive forked or sling-shot shaped horn, Brontotherium stood about eight feet tall at the shoulder and weighed about two tons.