Many taxa of dinosaurs evolved into successful herbivores. Of these, the principal groups were the basal Sauropodomorpha or prosauropods of the Late Triassic, the Sauropoda, and the Ornithischia. The most important taxa of orni-thischian dinosaurs were the Fabrosauridae, Heterodontosauridae, Hypsilopho-dontidae, Iguanodontidae, Hadrosauridae, Pachycephalosauridae, Stegosauria, Ankylosauria and Ceratopsia. Some of these were bipedal and will be dealt with after the quadrupedal forms.

If it did not feed upon the eggs of other dinosaurs (Sect. 9.9.3), the theropod Oviraptor could well have fed upon plant matter because its jaw muscles - as indicated by the bones of the skull - must have been rather similar to those of ceratopsians. Perhaps it ate both. In contrast to those of modern reptiles, the skulls of herbivorous dinosaurs were adapted in a number of ways for chewing vegetation. A transverse power stroke was achieved by different methods in the various taxa for grinding food. Another feature of the versatility of dinosaurs was the ways in which they exploited all the positions in the mouth processor/gut processor continuum (King 1996), as explained below.

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