45.5 - 50.5 cm. 108 - 115 cm wingspan. 860 g. Bill dark flesh to blackish, hooked at tip. Forehead, crown, nape area below the eye dark brown create capped appearance. Rest of head and neck white. Feathers of upperparts dark gray-brown, whitish at base. Feathers that cover uppertail white. Chest and belly white, belly with a central dark patch. Underwings white, black margin, coverts with dark mottling. Tail dark brown, wedge-shaped. Legs and feet flesh color, but for dark brownish outer side to tarsus and outer toe. Males and females are similar.