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White-throated whistler
The white-throated whistler (''Pachycephala graeffii vitiensis'') is a species of bird in the Pachycephalidae family, which is endemic to Fiji (Kadavu, Gau and the southern Lau Islands) and the Solomons (northern and central Santa Cruz Islands). It is variably considered a subspecies of a widespread ''P. pectoralis'' or treated as a separate species, but strong published evidence in favour of either treatment is limited, and further study is warranted to resolve the complex taxonomic situation.〔Boles, W. E. (2007). Golden Whistler (Pachycephala pectoralis). pp. 421-423 in: del Hoyo, J.; Elliot, A. & Christie, D. eds (2007). ''Handbook of the Birds of the World''. Volume 12: ''Picathartes to Tits and Chickadees.'' Lynx Edicions, Barcelona. ISBN 978-84-96553-42-2〕 Furthermore, ''P. vitiensis'' often includes ''P. graeffii'' as a subspecies, in which case the "combined" species is known as the Fiji whistler (a name restricted to ''P. graeffii'' when split from ''P. vitiensis'').〔(IOC World Bird List, version 1.7 )〕 While males of ''P. graeffii'' are yellow-throated, males of ''P. vitiensis'' are white-throated.〔 It has been speculated that these two groups are the result of separate waves of colonisations, with the yellow-throated being the result of an early colonisation, and the white-throated the result of a secondary colonisation.〔 Most taxonomic treatments today classify it as a subspecies of the Fiji whistler, (''P. graeffii'').
==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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