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__NOTOC__ Western Bonelli's warbler is a "warbler" in the leaf warbler genus ''Phylloscopus''. It was formerly regarded as the western subspecies of a wider "Bonelli's warbler" species, but as a result of modern taxonomic developments, this species is now usually considered to be two species:〔Parkin, David T. (2003): Birding and DNA: species for the new millennium. ''Bird Study'' 50(3): 223–242. (HTML abstract )〕〔Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. (2002): Taxonomic recommendations for European birds. ''Ibis'' 144(1): 153–159. (PDF fulltext )〕 * Western Bonelli's warbler, ''Phylloscopus bonelli'', which breeds in south west Europe and north Africa * Eastern Bonelli's warbler, ''Phylloscopus orientalis'', which breeds in south east Europe and Asia Minor The breeding ranges of the two species do not overlap; while their appearance and songs are very similar, the calls are completely different (see below). They also show marked difference in mtDNA sequence.〔Helbig, A. J.; Seibold, I.; Martens, J. & Wink, M. (1995): Genetic differentiation and phylogenetic relationships of Bonelli's Warbler ''Phylloscopus bonelli'' and Green Warbler ''P. nitidus''. ''J. Avian Biol.'' 26: 139–153.〕 The species is migratory, wintering in sub-Saharan Africa. It is a rare vagrant in Northern Europe. This bird is named after the Italian ornithologist Franco Andrea Bonelli. ==Description== Western Bonelli's warbler is a small passerine bird, found in forest and woodland. 4–6 eggs are laid in a nest on the ground. Like most warblers, western Bonelli's is insectivorous. The adult has a plain grey-green back, green-toned rump and wings and whitish underparts. The bill is small and pointed and the legs brown. The sexes are identical, as with most warblers. The western Bonelli's warbler has a browner tinge to the upperparts than eastern Bonelli's warbler; the latter sometimes has a greenish tinge instead. The song is a fast monotone trill, only slightly different from eastern Bonelli's, and also some similarity to wood warbler. The call of the western Bonelli's warbler is a disyllabic ''hu-it'', differing from that of eastern which is a completely different hard ''chup'', reminiscent of a crossbill or a house sparrow.〔Helb, H.-W.; Bergmann, H.-H. & Martens, J. (1982): Acoustic differences between populations of western and eastern Bonelli's Warblers (''Phylloscopus bonelli'', Sylviidae). ''Cellular and Molecular Life Sciences'' 38(3): 356–357.〕 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「Western Bonelli's warbler」の詳細全文を読む スポンサード リンク
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