The Masked Booby (Sula dactylatra) is a large seabird of the booby family, Sulidae. This species breeds on islands in tropical oceans, except in the eastern Atlantic; in the eastern Pacific it is replaced by the Nazca Booby, Sula granti, which was formerly regarded as a subspecies of Masked Booby. It is also called the Masked Gannet or the Blue-faced Booby.