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The Nightingale Reed-warbler (''Acrocephalus luscinius'') is a threatened song bird living on a few islands in the western Pacific. The Chamorro name for the bird is ''ga`ga` karisu'' (bird of the reeds). == Subspecies == Three subspecies have been described for the species ''Acrocephalus luscinius'', i.e. the Nightingale Reed-warbler: * ''Acrocephalus luscinius luscinius'', that is also considered a separate species (and if so, named ''Acrocephalus hiwae'') * ''Acrocephalus luscinius nijoi'' * ''Acrocephalus luscinius yamashinae'' ''Acrocephalus luscinius luscinius'' / ''Acrocephalus hiwae'' originally occurred on three islands: on Guam and on the two Northern Mariana Islands Saipan and Alamagan. On Guam, there are no Nightingale Reed-warblers anymore; the last sighting dates from 1969. On Saipan, an estimated population of 2700 specimen was reported in 2009, and on Alamagan 950 specimen were reported in 2010.〔 ''Acrocephalus luscinia nijoi'' originally occurred on the Northern Mariana Island Aguigan (also spelled Aguihan or Aguijan). Of this subspecies there never have been reports of a substantial population. In 1982 only four up to possibly 15 birds of the subspecies have been counted, and since 1995 none has been sighted, despite extended efforts to find specimens.〔 ''Acrocephalus luscinia yamashinae'' originally occurred on the Northern Mariana Island Pagan and "was extinct by the late 1970s". More precisely, in the 1970s, the 1980s, in 2000 and in 2010, the bird could not be found and is therefore presumed to be extinct.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nightingale reed warbler」の詳細全文を読む スポンサード リンク
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