Aceratherium is a genus of early rhinoceros that was quite short, without a horn, and fairly unremarkable. Its taller cousin Paraceratherium, however, is remarkably similar but significantly better known. Recognized more readily under the junior synonym Indricotherium. This Eurasian rhinocerotoid and cousin of extant rhinoceroses was one of the largest land mammals of all time. The shoulder of Paraceratherium was approximately 6 m (20 ft) high and its head was capable of reaching another 2 m (6 ft) out from the shoulders. The head itself was approximately 1.3 m (4.3 ft) long. Size, more than anything else, was the primary weapon of this enormous animal. Even their babies are fairly enormous, as we will see at some point during this week.