Euceratherium

The shrub-ox (Euceratherium collinum) is a genus and species of ovibovine caprine native to North America.

Euceratherium was one of the first bovids to enter North America. It appeared on the continent during the early Pleistocene, long before the first bison arrived from Eurasia. It became extinct about 11,500 years ago. It was formally described in 1904.[1]

Late Pleistocene shrub-ox remains are known from fossil finds spanning from northern California to central Mexico. In the East they were distributed at least into Illinois.

Euceratherium was massively built and in size between a modern American bison and a musk ox. A specimen was estimated to have a body mass of 607.5 kg (1,339 lb).[2] On the basis of preserved dung pellets, it has been established that they were browsers with a diet of trees and shrubs.[3] They seem to have preferred hilly landscapes.