Cats' and deer's (and other nocturnal animals') eyes shine because of a special irridescent layer called the tapetum lucidum, behind the retina and around the optic nerve, that acts like a mirror. Light passing into the cat's eyeball bounces offf the tapetum lucidum, giving the animal the ability to reflect (within its own eye) what little light is incoming, thus allowing it see in near darkness.
Why do dogs' and cats' eyes shine?
![Why do dogs' and cats' eyes shine?]()
Reviewed by Auto Incorrectable
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November 28, 2013
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