Alligator+Facts

The tell-tale eye-shine of an alligator (and other nocturnal vertebrates) is caused by a layer of cells called the tapetum lucidum (a Latin phrase meaning "bright carpet"). This structure is located beneath the photoreceptor cells (rods and cones) in the retina and reflects light back into these cells to increase the amount of light detected, which improves an alligator's vision in low light conditions. In alligators this eye-shine is red, but it can be different colors in other species. For more information, see the documents at the links below.
 * EYE-SHINE**

from Florida Fish and Wildlife []


 * Alligator eyes have two sets of eyelids. The outer lids are like human eyelids. They are made of skin and close top-to-bottom. The inner lids are clear and close back-to-front. While an alligator is sitting about or swimming, these inner eyelids protect the alligator's eyes and provide clearer vision in the underwater environment. **

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