Alcatraz Australiano Morus serrator

Large black-and-white seabird with heavy, pointed bill. Adult white with black flight feathers and central tail feathers, yellow-washed head. Feeds in spectacular fashion, plunge-diving into the ocean to capture prey. Juvenile mostly dark with many small white spots. Widespread off southern Australian coastlines and in New Zealand. Breeds in large colonies. In northern parts of range, compare Masked Booby, which has black trailing edge to inner wing, all-black tail, and heavy yellow bill.