Bay-breasted warbler, May 15, 2018, Rondeau Provincial Park, Ontario Canada.

One of my favourite warblers.
Setophaga castanea
Bay-breasted Warblers are voracious predators of spruce budworms. One study concluded that they consumed over 13,000 budworms per hectare (about 2.5 acres) in just 41 days.
source - Cornell Lab of Ornithology.

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