Kusaie Island = Kosrae, Caroline Islands.
Kosrae (E Caroline Is).
Known only from a series of six specimens taken in 1827, of which five survive, collected from montane forest. None was seen in 1880, when the island was next visited by an ornithologist. Extinction is thought to have been at least partly attributable to rats, introduced by whalers, who frequently visited the island, but forest disturbance, related to the increasing human population, is likely also to have been responsible.