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Why Do Ducks Have 3 Eyelids? [Solved]
Ducks have 3 eyelids. In addition to having an upper and lower eyelid, ducks, as well as all birds, have a third eyelid called nictitating membrane. The nictitating membrane is a thin fold of skin that is nearly transparent and whitish in color. Its purpose is to moisten, clean and protect the surface of the eye.
10 Interesting Facts About Ducks
Duck
Did you know that ducks have 3 eyelids?
Maewnam
Why do humans have a third eyelid? - Dorsa Amir
Discover how evolution and natural selection influence why the human body