American Goldfinch (Carduelis tristis). Photo by Donna L. Long.

How and Why Birds Change their Plummage.

American Goldfinch (Carduelis tristis). Photo by Donna L. Long.
American Goldfinch (Carduelis tristis) eating the seeds of the native Purple Coneflower. Photo by Donna L. Long.

via Why birds lose their feathers — What are bird molts? | Audubon

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