Early ornithischians

These are the early and small bird-hipped dinosaurs that sit outside the main groups, such as the heterodontosaurs. Most were small, two-legged plant-eaters or omnivores with a beak at the front of the mouth.

Heterodontosaurus from southern Africa had three kinds of teeth, including tusk-like canines. Kulindadromeus from Siberia shows that some had simple filaments on the body as well as scales.