Nazca Booby

Nazca Booby (Sula granti) is a large white booby with black flight feathers and tail and a substantial orange or pinkish bill. Body shape, bill structure, plumage pattern and voice provide the strongest field characters. Age, sex and season may alter its appearance, so identification should combine several features and careful direct field comparisons with similar species in the same habitat (Wikipedia, general species account).

It inhabits the eastern tropical Pacific, plunge-dives for fish and squid and nests on open ground in island colonies. Its movements and social behaviour vary through the year, with breeding birds generally more dispersed and non-breeding birds gathering where food is concentrated. Japanese records place it within the country's documented avifauna as a resident, migrant or visitor (Wikipedia, general species account; Wildlife of Japan occurrence records).