Bay-breasted warbler

Rondeau Provincial Park, Ontario, Canada, Aug 22, 2021.


Another fall migrant that stopped in the yard long enough to be photographed. An entirely different look from the spring plumage.
Setophaga castanea
In contrast to the more stable populations of other warblers, Bay-breasted Warbler numbers go up and down depending on outbreaks of the spruce budworm. The birds are abundant during infestations, but decline or even disappear from some areas a few years later. A similar relationship with spruce budworm exists for Tennessee and Cape May Warblers. Blackburnian and Blackpoll Warblers also readily consume budworms but are not as specialized in their diets.
source- Cornell Lab of Ornithology.

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