Periodic plumage changes in birds

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Periodic plumage changes in birds
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Gavia immer (Brünnich) Great Northern Loon
Gaviiformes, Gaviidae
Adult in breeding plumage.
Canada, Ontario, Kashagawigamog Lake.
6/23/2014
AN005'01-140623023'JJK.jpg
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Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds Periodic plumage changes in birds