Brontotherium
Brontotherium is a genus of brontothere that lived during the Eocene period. Male brontotheres have been observed very differently with females.
Other inhabitants
Brontotherium co-existed with Embolotherium, Indricotherium, Hyaenodon, Chalicotherium and Paraceratherium, as well as ocean-dwelling creatures like Dorudon, Basilosaurus and Otodus.
Brontotherium Media
Megacerops head reconstruction at the American Museum of Natural History
AMNH 518, from South Dakota. This M. coloradensis specimen has a healed broken rib, not pictured here.