[Answer] 4. A camel can live for 40 to 50 years. Why do they have three eyelids per eye?

Step 1 : Introduction to the question "4. A camel can live for 40 to 50 years. Why do they have three eyelids per eye?"

...1. To look pretty. 2. For secret camel flirting rituals. 3. To protect their eyes against the desert sand. 4. So they can nap and still look alert. Camels have an upper and a lower lid similar to humans, but they also have a third eyelid which moves from the side to constantly clean the eye. They can keep the third eyelid closed for protection from sandstorms, since it's transparent enough to see through.

Step 2 : Answer to the question "4. A camel can live for 40 to 50 years. Why do they have three eyelids per eye?"

To protect their eyes against the desert sand.:

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