Periodic plumage changes in birds
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Chroicocephalus philadelphia
Bonaparte's Gull
Adult in winter plumage.
Canada, Ontario, Barrie.
9/25/2021
AN032'04-210925028'JJK
![Periodic plumage changes in birds](/resources/small/128/Periodic-plumage-changes-in-birds-16957.jpg)
![Periodic plumage changes in birds](/resources/small/128/Periodic-plumage-changes-in-birds-29272.jpg)
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