SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Dinosaur footprint. Dinosaur footprint made by a theropod. The theropod (meaning "beast-footed") dinosaurs were nearly all two-legged carnivores, the most famous of which was Tyrannosaurus rex. Footprints such as this, show that theropods moved faster and moved more purposefully than large plant-eating dinosaurs. Theropod fossils have been found from the late Triassic to the late Cretaceous periods (230-65 million years ago).
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