Living members of Palaeognathae range from to and weight can be from . Ostriches are the largest struthioniforms (members of the order Struthioniformes), with long legs and neck. They range in height from and weigh from . They have loose-feathered wings. Males have black and white feathers while the female has grayish brown feathers. They are unique among birds in that they retain only the third and fourth toe on each foot. Ostrich wings have claws, or unguals, on the first and second fingers (and, in some individuals, also on the third). Ostriches differ from other paleognathes in that they have a reduced vomer bone of the skull.