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Gansu leaf warbler
The Gansu leaf warbler (''Phylloscopus kansuensis'') is a small passerine bird known only from China. It belongs to the leaf warbler genus ''Phylloscopus'' within the family Phylloscopidae. It was formerly treated as a subspecies of Pallas's warbler (''P. proregulus'') but is now regarded as a separate species based on differences in voice and cytochrome-b gene sequences.〔Martens, Jochen; Dieter Thomas Tietze, Siegfried Eck & Michael Veith (2004) (Radiation and species limits in the Asian Pallas's warbler complex (''Phylloscopus proregulus'' s.l.) ), ''Journal of Ornithology'', 145 (3): 206-222. (only )〕
It is 10 cm long, slightly larger than Pallas's warbler. It has greenish upperparts, pale underparts and a pale rump. The head has a long white supercilium and a pale stripe along the centre of the crown. The wings have one conspicuous wingbar, a slight second bar and whitish edges to the tertials.〔MacKinnon, John & Karen Phillipps (2000) ''A Field Guide to the Birds of China'', Oxford University Press, Oxford.〕
The song is very different from Pallas's warbler and consists of a thin, high-pitched note followed by a series of accelerating notes and finally a trill.〔
It is known to breed only in Gansu and Qinghai provinces in northern China. Its wintering grounds are uncertain but probably lie in Yunnan province in southern China.〔 It is found up to 3,200 metres above sea-level in deciduous forest with some spruce and juniper.〔〔BirdLife International (2009) (Species factsheet: ''Phylloscopus kansuensis''. ) Downloaded from http://www.birdlife.org on 28 June 2009〕 It is not currently known to be threatened with extinction and so is classed as a species of Least Concern by BirdLife International.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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