The fossilised skull of a Rhinocerotoidae has been found in the Khongor soum of Darkhan-Uul province in the north of Mongolia. Herder G.Batsukh found the paleontological remains of the extinct animal at ‘Khushuut Tokhoi’ and reported to the administration of the provincial museum. Paleontologists from Ulaanbaatar and staff from the local museum are studying the  fossilised skull which measures 80 cm by 35 cm.

Rhinocerotoidea is a superfamily that comprises rhinoceroses and their relatives – living and extrinct – and is grouped into the families Hyracodontidae, Amynodontidae, and Rhinocerotidae.