From: http://www.waunakee.k12.wi.us/intermediate/webfair2003/iceage/uintatherium.htm

The uintatherium was an enormous rhino-like mammal, but it is not like the wooly rhino because they don't have any living decedents . Also, despite their looks, they are definitely not like a dinosaur. The uintatheriums were from the Eocene in North America.

The fully grown uintatheriums grew to about 13 feet long (4 meters), and their weight was about 2.25 tons. The male uintatheriums had sharp canine teeth that pointed towards the ground. They had four thick legs with elephant like feet. As you can see from the picture to the left and right, they grew three pairs of bony horns on their head, and something you can't see is that they had very small brains.

Like the wooly rhino, the uintatheriums were herbivores. The mainly lived in forests were there were leaves and soft plants that they could eat.