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Yellow-rumped warbler : ウィキペディア英語版 | Yellow-rumped warbler
Four closely related North American bird forms—the eastern myrtle warbler (ssp ''coronata''), its western counterpart, Audubon's warbler (ssp group ''auduboni''), the northwest Mexican black-fronted warbler (ssp ''nigrifrons''), and the Guatemalan Goldman's warbler (ssp ''goldmani'')—are periodically lumped as the yellow-rumped warbler (''Setophaga coronata''). ==Classification== Since 1973, the American Ornithologists' Union has elected to merge these passerine birds as one species. The myrtle form was apparently separated from the others by glaciation during the Pleistocene, and the Audubon's form may have originated more recently through hybridization between the myrtle warbler and the Mexican ''nigrifrons'' form.
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