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Evolution trivia: Third Eyelid of modern human evolution

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If you watch a cat blink, you will see a white membrane cross its eye – that is called its third eyelid. It is quite a rare thing in mammals, but common in birds, reptiles, and fish. Humans have a remnant (but non-working) third eyelid (you can see it in the picture above).

Evolution trivia: Third Eyelid of modern human evolution
Evolution trivia: Third Eyelid of modern human evolution

It has become quite small in humans, but some populations have more visible portions than others.

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There is only one known species of primate that still has a functioning third eyelid, and that is the Calabar angwantibo (closely related to lorises) which lives in West Africa.

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