Northern parula.
Northern parula, Rondeau Provincial Park, Ontario, Canada, May 10, 2018.
Setophaga americana
Before this species received the name Northern Parula (a diminutive form of parus, meaning little titmouse), Mark Catesby, an English naturalist, called it a "finch creeper" and John James Audubon and Alexander Wilson called it a "blue yellow-backed warbler."
source - https://www.allaboutbirds.org/guide/Northern_Parula/
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