Paleontologists have found fossils of hundreds of different kinds of dinosaurs that lived all over the world.Some dinosaurs were small like birds.Other dinosaurs were much bigger than an elephant.
Paleontologists divide dinosaurs into two groups,or orders,by the way their hips looked.One group had hips that were like birds’hips.They called this order Ornithischia.The other group had hips like those of lizards.They called this order Saurischia.
There were three basic kinds of dinosaurs in the Saurischia order:theropods,prosauropods,and sauropods.There were five basic kinds of dinosaurs in the Ornithischia order:stegosaurs,ankylosaurs,ornithopods,pachycephalosaurs,and ceratopsians.
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