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.