From the picture above you could easily imagine that the animal kingdom had suddenly been enveloped in its own zombie apocalypse. Yet this is not a still from a forthcoming episode of
The Squawking Dead. Thanks to high speed photography, these photographs capture the
nictitating membrane in action. It is also known as the third eyelid, haw and the inner eyelid. It is drawn across the eye to protect and moisturize it while retaining visibility. The
Ark in Space today has a feature on this extraordinary structure of the eye.
Image Credit Flickr User Simon
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