Rondeau Provincial Park, Oct 10, 2022.
Vireos are still passing through on migration.
We also had a blue-headed vireo.
Vireo olivaceus
The red iris that gives the Red-eyed Vireo its name doesn't develop until the end of the birds' first winter. Then the brown iris the birds were born with becomes dull brick red to bright crimson in different individuals.
source - allaboutbird-org.
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