Falcarius was a rather small, 4 metres (13 ft) long, bipedal herbivore. It had a small head and a long neck and tail. The find of Falcarius, along with the recently discovered therizinosauroid Beipiaosaurus from the Early Cretaceous of China, clarifies the early evolution of the Therizinosauria and their relationship with the larger group of theropod dinosaurs, because Falcarius is a transitional form between older theropods and the much more changed Therizinosauridae.