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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