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Velociraptor, (genus Velociraptor), sickle-clawed dinosaur that flourished in central and eastern Asia during the Late Cretaceous Period (99 million to 65 million years ago). It is closely related to the North American Deinonychus of the Early Cretaceous in that both reptiles were dromaeosaurs. Both possessed an unusually large claw on each foot, as well as ossified tendon reinforcements in the tail that enabled them to maintain balance while striking and slashing at prey with one foot upraised. Velociraptor was smaller than Deinonychus, reaching a length of only 1.8 metres (6 feet) and perhaps weighing no more than 45 kg (100 pounds). Velociraptor appears to have been a swift, agile predator of small herbivores.