Periodic plumage changes in birds
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Larus delawarensis
Ring-billed Gull
Adult in winter plumage.
Canada, Ontario, Burlington.
12/23/2012
AN008'07-121223022'JJK
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![Periodic plumage changes in birds](/resources/small/128/Periodic-plumage-changes-in-birds-29272.jpg)
![Periodic plumage changes in birds](/resources/small/128/Periodic-plumage-changes-in-birds-7220.jpg)
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