Megacerops

The Megacerops is a three-part fossil in the introduced in.

Real-world information
Megacerops was a large herbivorous mammal that lived in North America during the Late Eocene (38-33.9 million years ago). While it resembles a rhinoceros, its closest modern relatives are actually horses. Megacerops was also far larger than any rhinoceros, reaching sizes that rival those of modern elephants. Based on the shape of its teeth, Megacerops likely preferred softer vegetation.

Males have been found with partially healed rib fractures, leading many to hypothesize that males would use their horns to fight, as no other animal known from their ecosystem could have made those wounds.