(meg-a-RAP-tor) a large bipedal late Cretaceous dinosaur with two large, sickle-like toe claws. Until Megaraptor was discovered in South America during 1966, dromaeosaurids were thought to be restricted to North America and Asia. When the dinosaur was alive, the claws would have been sheathed in a horny, keratinous material, making this claw well over 14 inches long.