Four species are recognised, which were largely confined to the Pontic–Caspian steppe, the Caucasus and Central Asia. The best known, "E. sibiricum", known as the Siberian unicorn, was the size of a mammoth and is thought to have borne a large, thick horn on its forehead. Like all rhinoceroses, elasmotheres were herbivorous. Unlike any other rhinos and any other ungulates aside from some notoungulates, its high-crowned molars were ever-growing. Its legs were longer than those of other rhinos and were adapted for galloping, giving it a horse-like gait.