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The blue noddy or hinaokū or manuohina ( Anous ceruleus) is a seabird in the family Laridae. It is also known as the blue-grey noddy.
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 seabird observed at Necker Island, the French Frigate Shoals, and Nīhoa during a cruise through the Northwestern Hawaiian Islands by the United States Fish Commission research ship in 1902 originally was thought to be new to science and was given the scientific name Procelsterna saxatalis and the popular name Necker Island tern. It later was reclassified as a subspecies of the blue noddy. There are five subspecies:
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