A Black Vulture catching some sun. Louisville, Kentucky, 11/08/2020

I heard one reason birds will spread their wings and sunbathe is because it will kill mites and other parasites that live on their feathers.

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@eric I always thought it was sweaty pits! We don't get Black Vultures here (only Turkey Vultures and, in some places, California Condors), so thanks for the treat.

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Personal instance for myself.