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Triceratops had three horns on its face and a big bony frill.

Triceratops had three horns on its face and a big bony frill.

The horns and frill helped keep it safe. Its name even means "three-horned face."

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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. 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. Argentinosaurus was one of the biggest dinosaurs that ever lived. Argentinosaurus was one of the biggest dinosaurs that ever lived.