(Bennett, FD, 1840)
It is found in American Samoa, the Cook Islands, Fiji, French Polynesia, Kiribati, Marshall Islands, New Caledonia, Samoa, Tonga (Niua), Tuvalu and Hawaii. It has occurred as a vagrant in Australia and Japan. Its natural habitat is open, shallow seas in tropical and subtropical regions.
The blue noddy was formerly placed in the genus Procelsterna. A molecular phylogenetic study published in 2016 found that the five noddies formed a single clade with the blue noddy and the grey noddy in Procelsterna nested between the species in the genus Anous. The authors proposed that the noddies should be merged into a single genus Anous and that Procelsterna should be considered as a junior synonym.
- A. c. saxatilis (Fisher, 1903): Marcus Island & north Marshall Islands to northwest Hawaii
- A. c. cerulea (Bennett, 1840): Kiritimati Island & the Marquesas Islands
- A. c. nebouxi (Mathews, 1912): Phoenix Islands, Tuvalu, Fiji & the Samoan Islands
- A. c. teretirostris (Lafresnaye, 1841):Tuamotu Archipelago, Cook, Austral & Society Islands
- A. c. murphyi (Mougin & Naurois, 1981): Gambier Islands (French Polynesia)
The grey noddy (Anous albivitta) replaces it to the south of its range; the two were formerly considered to be a single species but are now often split.
The blue noddy is 25–28 cm (9.8–11.0 in) in length and has a wingspan of 46–60 cm (18–24 in).
- BirdLife International (2012). "Procelsterna cerulea". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Bennett, Frederick Debell (1840). Narrative of a Whaling Voyage Round the Globe, from the year 1833 to 1836. Volume 2. London: Richard Bentley. pp. 248–249.
- Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 83. ISBN 978-1-4081-2501-4.
- Cibois, A.; Thibault, J.-C.; Rocamora, G.; Pasquet, E. (2016). "Molecular phylogeny and systematics of Blue and Grey Noddies (Procelsterna)". Ibis. 158 (2): 433–438. doi:10.1111/ibi.12363.
- Gill, Frank; Donsker, David, eds. (2017). "Coursers, noddies, gulls, terns, auks & sandgrouse". World Bird List Version 7.1. International Ornithologists' Union. Retrieved 16 April 2017.
- Gochfeld, M.; Burger, J.; Garcia, E.F.J. "Blue Noddy (Procelsterna cerulea)". 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. Retrieved 17 April 2017.
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