ocr: FAMILIESA Dingsaurs are divided into groupe according to their skeletal stauctures. There are two maio groupe called orders- ofc aincsaurs. ihose with hip structurts like izards are called saurischtans, or lzatd- hipped", those witt: hips like birdis are called orithlechuans, or" "bird-nipped. DINOSAURS AURSCHIANS ORNITHISCHIANS Cestopsians u Eropous MD AcTYLAPCALO: Meropdds a - stesoaur NEPTILSS RESTILES CFTHE: AIP. DFTHE SEA OrNhnoss
