Engbring, J. 1992. A summary of: a survey of the forest birds of the Republic of Palau. U.S. Fish and Wildlife Service, Honolulu, Hawaii. Publication Year 1992 Colonies Surveyed (8) Palau EEZ - Colony: Rock Islands View Colony Palau EEZ - Colony: Peleliou View Colony Palau EEZ - Colony: Ngeruangel View Colony Palau EEZ - Colony: Ngeriungs View Colony Palau EEZ - Colony: Ngeaur View Colony Palau EEZ - Colony: Ngarapalas Island View Colony Palau EEZ - Colony: Elibel View Colony Palau EEZ - Colony: Babelthuap View Colony