The Bay-breasted Warbler is a large, stocky warbler that irrupts north in large numbers during spruce budworm outbreaks, which supercharge its food supply. Breeding males are dramatically colored with chestnut crown, throat, and flanks. In fall, it becomes one of the most difficult warblers to identify, becoming olive-green and resembling the Blackpoll Warbler.
Habitat
Boreal spruce-fir forests of Canada; shrubs and woodland in migration
Diet
Spruce budworm larvae during outbreaks; caterpillars and insects generally
How common
Uncommon
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