135 cm. 6500 g. Large size. Bill black, heavy, sharp-pointed, slightly upturned. Head and neck bare, black except for red area at base of neck. Plumage entirely white. Legs black. Males and females are similar. Male: Red area at base of neck brighter. Female: Red area at base of neck paler. Immatures have head and neck covered with sparse grayish down, rest of plumage grayish, more or less mixed with white.