The mystery bird.
We were unable to identify this young bird.
Our various field guides don't show immature birds and the Merlin app couldn't identify it either.
Thanks to a lot of people responding to an enquiry on Ontario Birds we found out it is an immature scarlet tanager.
Rondeau Provincial Park, Ontario, Canada, July 6, 2025.
Piranga olivacea
The oldest Scarlet Tanager on record was a male, and at least 11 years, 11 months old. He was banded in Pennsylvania in 1990 and found in Texas in 2001.

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