Saturday, May 2

Yellow-Rumped Warbler(ButterButt)

Sheridan Park, Milwaukee 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 form.
-wiki

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