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Some plant-eating dinosaurs swallowed stones to help grind up food.

Some plant-eating dinosaurs swallowed stones to help grind up food.

The little stones stayed in their tummies and mashed the tough plants they ate.

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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. 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.