JAIME CHIRINOS / SCIENCE PHOTO LIBRARY JAIME CHIRINOS / SCIENCE PHOTO LIBRARY
Allosaurus attacking a Stegosaurus dinosaur, illustration. Allosaurus (left) is a carnivorous predatory theropod dinosaur that reached lengths of 12 metres. Stegosaurus is a herbivorous armoured dinosaur that reached lengths of 9 metres. Both these dinosaurs lived 155 to 150 million years ago during the Late Jurassic. Their fossils have been found in what is now western North America and Portugal.
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