Dinosaurs are divided into two main groups. One is called the saurischians and the other the ornithischians. The way to tell them apart is by their hips. Saurischian means lizard-hips and you can tell a saurischian hip bone because this bone in front, called the pubis, sticks out. With ornithischians -- a word that means bird-hipped -- the pubis bone is turned backwards.

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