Therizinosaurus
New, well-preserved finds such as Alxasaurus in 1993 and Beipiaosaurus in 1996 provided details about the bird-like pelvis, feet and skulls of primitive members. This helped confirm they belonged to the same group of theropod dinosaurs as Therizinosaurus and that therizinosaurs were, more specifically, advanced, herbivorous maniraptoran theropods.