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13 cm; (5.25 ins)
Female: similar but paler
First winter birds
 Similar Species
Mourning Warbler lacks the white eye crescents.
Hybrids between the 2 species occur where the range overlaps.
Breeds in the western United States and Canada from southern Northwest Territories south to central California, Utah and Colorado, scattered populations south and east of regular range; wintering on the Pacific slope of Mexico.
Subspecies monticola is not recognised by most authorities.
Coniferous forest edges, burns, dense thickets, and streamside growth.
May to August at up to 300m in dense understory along forest edges and clearings. The nest is a cup of plant stalks and grasses, lined with rootlets, hair and fine grasses, and concealed low down in a bush. 3-6 eggs are incubated for 11-13 days, young fledge after 8-9 days. Nests are only rarely parasitized by Brown-headed Cowbird.
Almost entirely insects and other arthropods, including beetles, caterpillars and leafhoppers. Forages low in dense shrub cover.
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