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Therizinosaurus ('reaping lizard', from the Greek "therizo" meaning 'to reap' or 'to cut off' and "sauros" meaning 'lizard') was a very large therizinosaur (previously known as segnosaur). It could grow up to 10 meters (33 feet) long and reach 5 tonnes in weight.Therizinosaurus lived in the late Cretaceous Period (late Campanian-early Maastrichtian stages, around 70 million years ago), and was one of the last and largest representatives of its unique group, the Therizinosauria ('reaping lizards').