Fun fact about this bird (from Cornell University All About Birds) ~
“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.”
Apparently the Bay-breasted warbler is a very picky eater.
Your pic is a perfect example of the Bay-breasted Warbler. Thanks for including the interesting information about its population size.
Beautiful!