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A third eyelid?

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A third eyelid offers extra protection and lubrication for eyes of certain animal species. Can you name a few species with third eyelids, including one that might surprise most people?

You’ll often find a third transparent eyelid in animals whose eyes need protection from swimming underwater, including frogs, beavers, and sea lions. Cats and dogs have third eyelids, too, along with many other animals including horses.

The third eyelid usually is folded away, out of sight underneath regular eyelids. But if animals encounter blowing dirt or need extra lubrication, their third eyelid may be seen sweeping across the eye.

Birds may use their third eyelid for blinking, while regular eyelids are closed for sleeping.

You might be surprised to learn that humans have a third eyelid, too–or, rather, the remnant of one that can be seen as a bit of pink folded tissue in the inner corner of the eye. While technically this no longer is a third eyelid, the remnant does suggest that one existed long ago in the human evolutionary past.

Third eyelids more technically are known as haws or nictitating membranes.

vision.about.com, 2006

www.rebuild-your-vision.com/2008/06/do-animals-see-the-way-we-do/

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