Periodic plumage changes in birds

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Periodic plumage changes in birds
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Chroicocephalus ridibundus (L.) Black-headed Gull
Charadriiformes, Laridae
In 2nd winter plumage.
Polska, Mazowieckie, Warszawa.
2/17/2013
AE008'05-130217014'JJK
All from this album
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