The Black-throated Blue Warbler is one of the most sexually dimorphic warblers — males are a deep cobalt blue with a black face and throat, while females are plain brownish-olive and were once thought to be a different species. Both sexes share a distinctive small white wing spot. It breeds in understory shrubs of mountain forests in the Appalachians and northeastern North America.
Habitat
Understory of mature deciduous and mixed mountain forests
Diet
Caterpillars, spiders, flies, and small berries
How common
Common
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