did you know … ?

The third eyelid (otherwise known as nictitating membrance, nictitans or haw) provides an extra layer of eye protection for cats.  Beginning at the corner of the eye nearest the nose, the retractable third eyelid can be hidden from view or can extend across the surface of the eye.  It can vary from white to light pink in color and lies on top of the eye, but underneath the eyelids.  It contains cartilage and a tear-producing gland at its base and can appear reddened when irritated.

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