T. Michael Keesey wrote:
Apart from modern birds, there is no proof of omnivory in any dinosaur. But here is a list of some groups for which omnivory has been suggested: - basal _Dinosauria_ (including basal theropods, sauropodomorphs, and ornithischians) - _Oviraptorosauria_ - _Therizinosauria_ - _Troodontidae_ (which are supposed to have similar dentition to _Pachycephalosauria_....) - _Omnivoropteryx_ (obviously) and many other avian taxa