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The oldest dinosaur fossils are more than 200 million years old.

The oldest dinosaur fossils are more than 200 million years old.

Dinosaurs lived a very, very long time ago — long before there were any people.

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Some dinosaurs were smaller than a chicken. Some dinosaurs were smaller than a chicken. Many scientists think birds are the cousins of dinosaurs. Many scientists think birds are the cousins of dinosaurs. Triceratops had three horns on its face and a big bony frill. Triceratops had three horns on its face and a big bony frill. Some plant-eating dinosaurs swallowed stones to help grind up food. Some plant-eating dinosaurs swallowed stones to help grind up food. Stegosaurus had rows of bony plates along its back. Stegosaurus had rows of bony plates along its back.