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The timberline sparrow (''Spizella breweri taverneri'') is a taxonomically controversial American sparrow. Usually treated as a subspecies of Brewer's sparrow, it is still considered a distinct species ''Spizella taverneri'' by many authorities. While the timberline sparrow recognizably differs in some details, there is little reproductive isolation between the taxa. When it was still considered a good species, it was listed as being of least concern by the IUCN.〔E.g. Baillie ''et al.'' (2004).〕 ==Footnotes== 〔 ==References== * (2004): ''2004 IUCN Red List of Threatened Species. A Global Species Assessment.'' IUCN, Gland, Switzerland and Cambridge, UK. ISBN 2-8317-0826-5 * 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「timberline sparrow」の詳細全文を読む スポンサード リンク
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