MASATO HATTORI / SCIENCE PHOTO LIBRARY MASATO HATTORI / SCIENCE PHOTO LIBRARY
Pachycephalosaurus fighting Stegoceras. Computer illustration of a Pachycephalosaurus sp. dinosaur pushing a Stegoceras sp. dinosaur off a cliff. These bipedal herbivorous dinosaurs lived during the Late Cretaceous Period (around 100 to 66 million years ago) in what is now North America.
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