English: Deinonychus is a medium-sized dromaeosaur known for the large sickle-shaped talon on the second toe on each foot, from which it gets it its name. It was an active, agile predator that could grow to about 3.5 m in length and weighed around 70 kg. In addition to its famous toe claw, Deinonychus was equipped with powerful jaws containing around seventy curved blade-like teeth. The discovery of Deinonychus revived the hypothesis that birds are descended from dinosaurs - an idea which is now widely accepted. Deinonychus, like all dromaeosaurs, was covered in feathers and may have been warm-blooded.