Cats' upper and lower eyelids, like those of humans, sheathe the eyeballs. For further protection, all cats have an opaque, white third eyelid, called the nictitating membrane, between the lower lid and inside corner of each eye. This layer helps moisten the eye and clear dust from the surface of the cornea. When dozing, this third eyelid closes, perhaps to act as a shade. As soon as the sleeping cat is alerted by any sound, the nictitating membrane flicks back to the inside corner of the eye.
Matt: CORRECT (i think)
Record: 150-126
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