The Third Eyelid

Great horned owl blinking its thrid eyelid (photo by Chuck Tague)
Great horned owl blinking its thrid eyelid (photo by Chuck Tague)

Did you know that birds have three eyelids?

Did you know they can see through the third eyelid, at least a little, because it's transparent or translucent?

Read more about this fascinating and useful part of bird anatomy in this vintage article from 2010 about the Nictitating Membrane

 

(photo by Chuck Tague)

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