Atlantisia rogersi is confined to the South Atlantic island of Inaccessible, Tristan da Cunha (St Helena to UK). The population has been variously estimated as 1,200 birds in 1938⁵, 5,000-10,000 birds in 1952³ and 1,000-2,000 breeding pairs in 1974⁶. The most accurate survey to date gave an estimate of 8,400 birds⁴. It is abundant on the island and may be at carrying capacity given its high population density, delayed maturity, small clutch-size, and lack of major predators or competitors^4,9.