The Audubon's subspecies group is not very dissimilar to the myrtle: in summers, males of both forms have streaked backs of black on slate blue, white wing patches, a streaked breast, and conspicuous yellow patches on the crown, flank, and rump (the latter giving rise to the species's nickname "butter butt" among birdwatchers). Within the myrtle warbler group, adult males during the breeding season have gray backs with dark streaks, while females have brown backs in contrast male and female myrtle warblers can also be distinguished by their different cheek colors, with the former's being black and the latter having brown or gray cheeks. In spite of varying appearances, the yellow rump (as suggested by its name) is present in all subspecies and thus characterizes the yellow-rumped warbler. The yellow-rumped warbler has an average length of 14 cm and weight of 12.5 g, its appearance is known to be different across its subspecies groups, especially the two major ones: the coronata group (myrtle warbler) and the auduboni group (Audubon's warbler) intra-group variations are also observed. The genus name Setophaga is from ancient Greek ses, "moth", and phagos, "eating", and the specific coronata means "crowned". The myrtle and Audubon's groups, as two major subspecies, are distinguished by noticeable features such as different color of throat, etc. All subspecies groups of the yellow-rumped warbler are characterized by the yellow rump as its name implies, while intra-group and inter-group variations in appearance exist in spite of many similarities. nigrifrons ) and the Guatemalan Goldman's warbler (spp. group auduboni ) the northwest Mexican black-fronted warbler (spp. coronata ) its western counterpart, Audubon's warbler (spp. The species combines four closely related forms: the eastern myrtle warbler (spp. The diet of the yellow-rumped warbler is based primarily on insects, though the species does eat fruits such as juniper berries as well, especially in winter. The species generally prefers coniferous forests or mixed coniferous-deciduous forests as its breeding habitat, while during the winter it can be found inhabiting more open areas such as shrublands that offer food resources. as well as Canada and Central America, with the population concentrating in the continent's northern parts during the breeding season and migrating southwards to southern North and Central America in Winter. Its extensive distribution range connects both the Pacific and Atlantic coasts of the U.S. The yellow-rumped warbler ( Setophaga coronata ) is a regular North American bird species that can be commonly observed all across the continent.
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