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Deinonychus is a genus of carnivorous dinosaurs that lived during the Early Cretaceous Period. Was the study of Drinonychus that revived the argument as to whether dinosaurs were warm or cold-blooded. Before this, the popular conception was that dinosaurs were plodding, reptilian giants. The study pointed out that the small, sleek, horizontal posture of the body and especially the enlarged raptorial claws (the so-called “terrible claw”) on the feet suggest an active, agile, warm blooded predator. With this study, the “dinosaur renaissance” began which in addition considering the possibility that some dinosaurs were warm-blooded, also proposed the birds evolved from dinosaurs. Typically, Deinonychus grew to a length of 11 feet (3.4 m) with a maximum weight of 220 pounds (100 kg). The mouth was equipped with powerful jaws and lines with about 70 curved blade-like teeth. Deinonychus possessed large “hands” with three claws on each forearm, the first digit was the shortest and the second the longest. Each hind foot had a sickle-shaped claw on the second digit that was used during predation. Because of its resemblance to birds, some paleontologists believe that Deinonychus may have been covered with feathers. The pack dinosaurs portrayed in Jurassic park were modeled after Deinonychus; the filmmakers called them Velociraptors.