Many birds show plumage patterns in ultraviolet light that are invisible to the human eye. Gray and white birds may look alike to the naked human eye, but birds can distinguish themselves by the presence of ultraviolet reflective patches on their feathers.
The females respond stronger to males with good UV-reflectiveness. An ultraviolet reflective patch might be displayed in courtship by posturing with the brightest UV- plumage fluffed.
This Tufted Titmouse and White-breasted Nuthatch may appear common but the more we understand, the more we can appreciate the beautiful nuances of the world around us.
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