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Aug 28, 2020

Nictating membrane over hawk's eye...

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. 

Please comment if you wish.
BarrytheBirder   

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