The Bustards appear, to form a link between Bails and Cranes on one side and Plovers on the other, but are nearest on the whole to the Cranes. They are schizognathous and holorhinal, with 10 or 17 cervical vertebrae, and with two small notches on each side of the posterior border of the sternum. No oil-gland. Caeca long. There is no hallux, and the deep flexor tendons simply unite, and then the united tendon divides into three. Ambiens muscle, accessory femoro-caudal, semitendinosus, and accessory semitendinosus present; femoro-caudal wanting. A single family.