The crisply plumaged Chestnut-sided Warbler beautifully captured in Leamington, Ontario by @backyard.birds.
According to the Audubon, the Chestnut-sided Warbler is apparently much more numerous today than it was historically.
John James Audubon, roaming eastern North America in the early 1800s, saw the Chestnut-sided Warbler only once.