The ilium was almost horizontally oriented, resulting in exceptionally broad hips. Little is known of the tail but the hip suggests that the tail was long. The legs were extremely long and slender, suggesting that "Avimimus" was a highly specialized runner. The proportions of the leg bones add further weight to the idea of "Avimimus" was quick on its feet. The animal's shins were long in comparison with its thighs, a trait common among cursorial animals. It also had three-toed feet with narrow pointed claws.