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Bush-warbler
Bush-warblers (or bush warblers) are small insectivorous songbirds belonging to the genera ''Cettia'' and ''Bradypterus''. They were formerly placed in the "wastebin" Old World warbler family. Neither genus as traditionally delimited is believed to be monophyletic.〔Alström ''et al.'' (2006)〕
Due to their external similarity convergently acquired by strong selective pressures due to the identical habitat, they were occasionally believed to be close relatives. However, they belong to two well-distant families in the Sylvioidea, the "warbler-and-babbler" superfamily:
* ''Cettia'', the cettiid bush-warblers or typical bush-warblers, belong in the Cettiidae, an ancient sylvioid lineage related to long-tailed tits.〔
* ''Bradypterus'', the megalurid bush-warblers, belong to in the Megaluridae, the grass-warbler family which is closely related to the Malagasy warblers and the peculiar black-capped donacobius from South America, formerly believed to be an aberrant wren.〔
==Footnotes==
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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