Photo by BarrytheBirder
It was only after I took the photo above, that I realized this hawk had covered the lens of its eye with the nictating membrane which many birds have as additional protection for their eyes. To some people the look is a little spooky but it is not frequently seen. The nictating membrane is a translucent third eyelid present in some birds, that can be moved across the eye, to protect and moisten it while maintaining vision. Some animals and reptiles have a similar ocular ability.
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BarrytheBirder
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