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Hand holding dinosaur bone fossils picked up off the ground from the Hanksville-Burpee Dinosaur Quarry in Utah, USA. The site is approximately 46 metres wide and 180 metres long. Excavations have uncovered the remains of at least one carnivorous dinosaur, a plant-eating Stegosaurus, and several sauropods (including Brontosaurus and Brachiosaurus) which are considered the largest animals to have ever lived on the earth. (KEYSTONE/SCIENCE PHOTO LIBRARY/Jon G. Fuller/VW PICS)