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Third Eyelid

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Third Eyelid

Post by sujin007 on Wed Nov 14, 2012 10:31 pm

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.

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Re: Third Eyelid

Post by sujin007 on Wed Nov 14, 2012 10:33 pm

Humans have a remnant but non-working, third eyelid . It has become quite small in humans, but some populations have more visible portions than others.

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Re: Third Eyelid

Post by sujin007 on Wed Nov 14, 2012 10:34 pm

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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