The ornithischia, or "bird-hipped" dinosaurs, are a group of dinosaurs having bird-like pelvic girdles, with four prongs to each side. All were herbivores. Four-legged types includes
the stegosaurs, with triangular bony plates
along the back, and the armadillo-like ankylosaurs. The two-legged duck-billed
dinosaurs were well equipped for swimming. There is some evidence that birds
are the living descendants of ornithiscians. See also saurischian.
|Reconstruction of a Late Triassic