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A third eyelid isn’t as uncommon as it sounds. Dozens of animals have a nictitating membrane, commonly referred to as a third eyelid. Camels are one of the largest mammals that boast third eyelids; the desert darling’s eyes need them to ward off the Sahara’s swirling sandstorms. Animals with a third eyelid use the thin, protective membrane to blink away debris, sharpen vision and enable themselves to see clearly underwater.
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