Wednesday, May 11

Yellow-Rumped Warbler

Yellow-Rumped Warbler
Eagle Lake Wisconsin

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).
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.
The yellow-rumped warbler breeds from eastern North America west to the Pacific, and southward from there into Western Mexico. "Goldman's" yellow-rumped warbler is endemic to the highlands of Guatemala.
-wiki

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