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.
Best time to see a Black-throated Blue Warbler
The best time to see a Black-throated Blue Warbler is May–September, when about 66% of U.S. sightings happen, based on 11,516 research-grade iNaturalist observations.
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