Saurischians
Well-known dinosaurs like the Tyrannosaurus rex, Deinonychus and Velociraptor fall into this order. Saurischians are divided into two groups.
- Sauropods are four-legged herbivores. They had long heads, long necks and long tails. Leaf-eating Apatosaurus, Brachiosaurus and Diplodocus fall into this family.
- Theropods are two-legged carnivores. There are some of the most fearsome dinosaurs, including Allosaurus and T. rex.
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