Red-eyed vireo

May 15, 2018, Rondeau Provincial Park, Ontario, Canada.


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.
The oldest known Red-eyed Vireo was at least 10 years, 2 months old when it was recaptured and rereleased during banding operation in Maryland.
source - https://www.allaboutbirds.org/guide/Red-eyed_Vireo

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