Deinonychus
Deinonychus  was a medium theropod dinosaur. It was a dromaeosaur, and also a larger relative of the famous Velociraptor. This 3.4 meter (11 ft) long Deinonychus lived during the Lower Cretaceous, about 115-108 million years ago. Fossils have been found in the U.S. states of Montana, Wyoming, and Oklahoma.