Hyracodon (`hyrax tooth`) is an extinct genus of mammal. It was a lightly built, pony-like mammal of about 1.5 m (5 ft) long. Hyracodon`s skull was large in comparison to the rest of the body. Hyracodon`s dentition resembled that of later rhinoceroses, but it was a much smaller animal and differed very little in appearance from the primitive h...