Bay-breasted warbler.

Bay breasted Warbler, May 15, 2018.

A splash of colour on a grey winters day.

Rondeau Provincial Park, Ontario, Canada.

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.