Theropods are a group of bipedal dinosaurs characterized by their hollow bones and three-toed limbs. This diverse clade includes both small and large species, such as the well-known Tyrannosaurus rex and the smaller Velociraptor. Theropods are also significant as they are the ancestors of modern birds, showcasing a fascinating evolutionary link between dinosaurs and avian species. Their features include sharp teeth, claws, and, in many cases, feathers.