Niau kingfisher (Todiramphus gertrudae) is the only subspecies of Tuamotu left after Mangareva Kingfisher (Todiramphus gambieri) became extinct in the late 19th century. It lives in NIAU atoll, FRENCH POLYNESIA. There is a single population of ~125 Niau Kingfishers, on a small sprig of coral in the South Pacific. That’s down from approximately 500 birds in 1974, making the Tuamotu one of the world’s most endangered species.