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Fact of the Day: Three Layers

Fact of the Day: Three Layers

Did you know that camels have three sets of eyelids?

 

 

Camels have not one, not two, but three eyelids. Called a nictitating membrane, the transparent lid helps keep out sand and dust; it can even improve vision, like a contact lens. Many animals, including dogs, cats, sharks, and some birds and amphibians, also have third eyelids.

 

 

Do you know any other fun facts? Send it to our editors and we’ll make it into a Fact of the Day for the #Nonitribe.

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