Many Animals Actually Have a Third, Transparent Eyelid. Here's Why.

Our family dog used to have a rather noticeable extra eyelid that became especially apparent when he dozed off, usually upturned on the rug. This is the fleshy curtain seen at the corner of each eye, closest to the nose. It's also commonly called the

Third eyelids sweep in a generally horizontal direction across the eye, instead of vertically as the upper and lower lids do. They're actually a specialised fold of theThey're found in many mammalian species, but are not unique to them. Birds, reptiles, amphibians and fish can also have a third eyelid.The structure varies too; in many species a cartilage skeleton provides support, while others contain glands that secrete tears.

Preventing, trapping and removing debris is crucial for desert animals like camels, where sand and dirt might damage the eye. Their third eyelid isThe third eyelid may offer protection from water, and a translucent membrane can aid underwater vision of aquatic animals, including, which also includes aardvarks). Larger species of sharks typically protect their eyes with their third eyelid when, the eyelid is used during rapid flight in hunting.

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