Full-bodied Warbler. Adult males (Myrtle) have a black mask, a white throat, yellow patches on their sides, and a yellow rump.
Adult males (Audubon's) have a yellow throat and rump and yellow patches on their sides.
Residents in Guatemala and eastern Chiapas, Mexico have black breasts and heads unlike individuals from the north that have grayer heads.
"Myrtle" and "Audubon's" Yellow-rumped Warblers breed with each other where their rangers overlap, resulting in intermediate forms (also known as intergrades)
Small songbird. Females (Myrtle) are brownish above with yellow patches on their sides, a yellow rump, and a white throat.
Females (Audubon's) tend to be grayer above with a yellow throat, yellow patches on their sides, and a yellow rump.
Resident females in Guatemala and eastern Chiapas, Mexico are darker brown-gray above with a yellow throat, yellow patches on their sides, a yellow rump, and a dark breast patch.
Immatures (Myrtle) are brownish and streaky throughout with pale yellow patches on their sides and a yellow rump. Amount of yellow on the sides and the amount of streaking varies.
Females (Myrtle) are brownish above with yellow patches on their sides, a yellow rump, a white throat, and a darker ear patch. Intensity of yellow varies.
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Yellow-rumped Warblers are fairly large, full-bodied warblers with a large head, sturdy bill, and long, narrow tail.
Large warbler; about the size of a Black-capped Chickadee
sparrow-sized or smallerThe Yellow-rumped Warbler has two distinct subspecies that used to be considered separate species: the "Myrtle" Warbler of the eastern U.S. and Canada's boreal forest, and "Audubon’s" Warbler of the mountainous West. The Audubon’s has a yellow throat; in the Myrtle subspecies the throat is white. Male "Audubon's" Warblers have more white in the wing than the "Myrtle" Warbler. Female Audubon's have less distinctly marked faces, lacking the dark ear patches of the "Myrtle" Warbler. Intermediate forms occur where the two subspecies' breeding ranges overlap, such as in the Canadian Rockies.
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