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This scientific illustration presents the side profile of a fossilized skull belonging to Brontotherium ingens (now often classified under the genus Megacerops), a massive, rhinoceros-like herbivore that inhabited the open plains of North America during the late Eocene epoch. The skull is defined by its deep, concave forehead and the presence of a pair of large, blunt, Y-shaped bony horns at the tip of the snout, which were likely covered in skin rather than keratin. These horns were significantly more developed in males, suggesting they were used for ritualized combat and social signaling. Despite their immense physical size—standing roughly eight feet tall at the shoulder—these "thunder beasts" possessed a remarkably small brain and primitive, low-crowned teeth suited for browsing on soft vegetation. These creatures were part of the Brontotheriidae family, a group of odd-toed ungulates that underwent a rapid increase in body size before their sudden extinction, which was likely caused by the shifting climate and the loss of their specialized forested habitats.