Were there herbivorous bipedal dinosaurs?

Yes. Hadrosaurs ("duckbill dinosaurs"; Hadrosaurus) were facultative bipeds (Facultative biped), they could run on two legs when escaping from predators. These large Ornithischian dinosaurs with flattened mouths (similar to a duck's bill) had massive flat molars that allow them to grind the aquatic vegetation they fed on. read more

Yes. Hadrosaurs ("duckbill dinosaurs"; Hadrosaurus) were facultative bipeds (Facultative biped), they could run on two legs when escaping from predators. read more

The Triassic bipeds became dinosaurs. After the previous extinction, available space was incredible and rents were low. The dinosaurs poised with their supremacy spread out like weedy opportunists. Surviving Triassic and becoming masters of the Mesozoic era, the bipedal predators diversified during the Jurrasic era. read more

Theropods were ancestrally carnivorous, although a number of theropod groups evolved to become herbivores, omnivores, piscivores, and insectivores. Theropods first appeared during the Carnian age of the late Triassic period 231.4 million years ago and included the sole large terrestrial carnivores from the Early Jurassic until at least the close of the Cretaceous, about 66 Ma. read more