Embolotherium

Embolotherium (Greek εμβωλή, embolê + θήριον, thêrion "battering ram beast", or "wedge beast") is a genus of brontothere that lived in Mongolia during the late Eocene epoch. It is most easily recognized by a large bony protuberance emanating from the anterior (front) of the skull.[1] This resembles a battering ram, hence the name Embolotherium. The animal is known from about 12 skulls, several jaws, and a variety of other skeletal elements from the Ulan Gochu formation of Inner Mongolia and the Irgilin Dzo of Outer Mongolia.