Stock Photo - Pachyrhinosaurus and theropod fighting. Computer illustration of Pachyrhinosaurus sp. (left) and theropod (right) dinosaurs fighting in a prehistoric forest. Pachyrhinosaurus lived during the Late Cretaceous period (around 100 to 66 million years ago), in what is now North America.

Stock Photo: Pachyrhinosaurus and theropod fighting. Computer illustration of Pachyrhinosaurus sp. (left) and theropod (right) dinosaurs fighting in a prehistoric forest.

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