Gigantoraptor (lit. 'giant thief') is a genus of large oviraptorosaur dinosaur that lived in Asia during the Late Cretaceous period. It is known from the Iren Dabasu Formation of Inner Mongolia, Gigantoraptor was the largest known oviraptorosaur, reaching 8 metres (26 ft) in length and 2 metric tons (2.2 short tons) in body mass. It had an extensively pneumatized vertebral column and elongated arms and legs. Both femur and tibia measured over 1 m (3.3 ft) in length