Any species of bipedal, carnivorous
saurischian in the suborder Theropoda. The chicken-sized
Compsognathus,the smallest known adult dinosaur, probably weighed 2 – 4 lb (1 – 2 kg); the
tyrannosaurs weighed tons. The theropods also included
Allosaurus,
Deinonychus, Megalosaurus, Oviraptor, and
Velociraptor. Theropod remains recovered have been from the Late
Triassic through the Late
Cretaceous Epoch (227 – 65 million years ago) from all continents except Antarctica. Their well-developed hind legs provided support and locomotion; their short forelimbs had mobile hands, probably for grasping and tearing prey. Despite the group's name, which means "beast (i.e., mammal) foot," theropod feet usually resembled those of birds. It is widely believed that all modern birds are descended from one line of small theropods.
For more information on theropod, visit Britannica.com.