Uintatherium is a mammal confirmed to appear in Additional Creatures 2: Wild ARK.
The Uintatherium, meaning "Uinta Beast" after the Uinta Mountains, is a large mammal species that lived in North America during the Eocene Epoch, 40 million years ago. It was one of the largest mammals of its time, being around the size of a modern rhino. Its most distinctive feature was the orray of ossicones that were on its head. It is unknown exactly as to what their purpose was, but the skull was shown to be able to take a lot of force, suggesting that they could have been used as weapons, if not for display. The other distinct feature of the creature was it bearing fangs, which were larger in the males. This observation has made scientists conclude that males used them to compete for mates.
It is unknown how Uintatherium will be in Additional Creatures. Only its design is known at this point.