 The lower jaw progressively elongated and became more spoon-shaped, possibly mimicking the function of the splayed incisor teeth in ruminants.The later species had stronger lips, indicated by the large size of the infraorbital foramen which supplies blood vessels, and, like modern day grazers, probably had horny pads on the lips.Like in other grazers, the snout had a square shape as opposed to the triangular shape in browsers.