Brontothere was a large prehistoric mammal from the Late Eocene. From hundreds of known specimens, it is known to have grown up to 2.5m tall at the shoulder.
Brontothere lived during the Late Eocene period from 38-30 million years ago.
Brontothere stood 2.5 meters tall and weighted around 2 tons. It was distantly related to horses and rhinos, but however they were not much like either. They were twice as big as modern rhinos, with brains just one third of the size.
In another difference to rhinos, the out growths on the noses were not horn or hair but bone. These were more for show than head–butting. The bone crests were far too brittle for that.