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Ornithischia The second major group of dinosaurs, the Ornithischians, includes the bipedal herbivorous dinosaurs; the plated dinosaurs; the armored dinosaurs; and the horned dinosaurs. The ornithopods. The ornithopods ("bird feet") had so many similarities to modern birds that, for years, scientists thought that the two groups were related. This diverse group became the most-widespread herbivores, thanks in part to the strong, compact, highly specialized teeth set far back in their mouths. Ornithopods had strong hind legs with a three-toed foot. Although they usually walked upright, they were able to stand on all fours. The Iguanodon (noted earlier as the first dinosaur fossil recorded) was an ornithopod. Interestingly, its hand