This solitary, graceful seabird took advantage of updrafts, soaring high over the ship's bow. They are said to be rare at sea here, breeding on remote atolls. This is an adult. Light eyed birds in the Western Pacific are included in the medium sized subspecies S. d. personata. Species formerly known as Blue-faced Booby. Canon PowerShot SX60 HS.
References:
Brazil, M.A. (1991) The Birds of Japan. Smithsonian Inst. Press.
Brazil, M. (2009) Birds of East Asia. Princeton Univ. Press.
Carboneras, C., Christie, D.A., Jutglar, F., Garcia, E.F.J. & Kirwan, G.M. (2019). Masked Booby (Sula dactylatra). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/52623 on 5 October 2019).
Marchant, S. & Higgins, P.J. (co-ordinating editors) 1990. Handbook of Australian, New Zealand & Antarctic Birds. Volume 1, Ratites to ducks; Part B, Australian pelican to ducks. Melbourne, Oxford University Press. Pages 737, 748, 763-772; plates 56 & 58.