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Asian desert warbler
The Asian desert warbler (''Sylvia nana'') is a typical warbler which breeds in the deserts of central and western Asia and the extreme east of Europe (Volga Delta area east to western Inner Mongolia in China), and migrating to similar habitats in southwestern Asia (Arabia to northwestern India) and the far northeast of Africa (Red Sea coastal regions) in winter. Until recently it was considered conspecific with the African desert warbler (and called just "desert warbler"),〔Del Hoyo, J., Elliot, A., & Christie, D. (editors). (2006). ''Handbook of the Birds of the World''. Volume 11: Old World Flycatchers to Old World Warblers. Lynx Edicions. ISBN 84-96553-06-X.〕 but is now given specific status.〔IOC World Bird List version 2.9: (Old World Warblers )〕〔Svensson, L., Mullarney, K. & Zetterström, D. (2009). ''Collins Bird Guide'', second edition. HarperCollins, London ISBN 978-0-00-726726-2.〕 The two are still each other's closest living relatives, and their relationships to other typical warblers are not clear. They may be fairly close to the Whitethroat; particularly, female Whitethroats look much like a richly-coloured Asian desert warbler. But it seems that all these three taxa are fairly basal members of the genus.〔Helbig, A. J. (2001). The characteristics of the genus: Phylogeny and biogeography of the genus ''Sylvia''. Pages 24–28 in: Shirihai, H., Gargallo, G., Helbig, A. J., & Harris, A. ''Sylvia Warblers''. Helm Identification Guides ISBN 0-7136-3984-9〕〔Jønsson, K. A., & Fjeldså, J. (2006). A phylogenetic supertree of oscine passerine birds (Aves: Passeri). ''Zool. Scripta'' 35 (2): 149–186. (HTML abstract).〕
It is a small bird (the second-smallest in the genus after African desert warbler), 11.5–12.5 cm long. The sexes are almost identical in colour, pale grey-brown above with browner wings and tail, and whitish below; the bill and legs are yellowish, and the eye has a yellow iris. Like its relatives, it is insectivorous, but will also take small berries; unlike most warblers, it commonly feeds on the ground. The song is a distinctive jingle often given in an advertisement flight, with a mix of clear and harsher notes. It breeds in semi-desert and dry steppe environments, as long as some bushes for nesting occur. The nest is built in low shrub, and 4–6 eggs are laid.〔〔
It has occurred as a rare vagrant as far west as Great Britain.〔Dymond, J. N., Fraser, P. A., & Gantlett, S. J. M. (1989). ''Rare Birds in Britain and Ireland''. T & A D Poyser ISBN 0-85661-053-4.〕
==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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