The name "Ornithischia" means "bird-hipped" and was chosen because of similarity of the animals' hip bones and pelvic joint to that of birds (although birds actually evolved from Saurischian ("lizard-hipped") dinosaurs).
All Ornithischian dinosaurs were herbivores (plant-eaters), whereas in contrast the Saurischians included herbivores, omnivores and carnivores. Other differences from Saurischians, include differences in their skulls (smaller holes in front of the eye sockets known as "antorbital fenestrae"), the development of armor in many Ornithischians, and an extra bone in the lower jaw, known as the "predentary".
The Ornithischian order has itself been divided into a number of subgroups. These include:
Ornithischian dinosaurs first appeared about 230 million years ago, and survived until the end of the Cretaceous period, about 65 million years ago
Types of Ornithischian Dinosaur
Here is a list of some Ornithischian dinosaurs:
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