The members of this order are an extinct group of gigantic mammals
commonly called _uintatheres_. _Uintatherium_ (Pl. 48), which is typical
of the group, had three pairs of blunt horns, and the males had
dagger-like upper tusks. Some of the uintatheres were as large as a
small elephant and stood as much as 7 feet tall at the shoulders. The
size of the brain in relation to the size of the body suggests that
these animals were not as intelligent as most mammals. Uintatheres are
known from rocks ranging from Paleocene to Eocene in age. Uintathere
remains have been reported from Big Bend National Park in Trans-Pecos
Texas.