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Why do some animals have glowing eyes?

"In the dark, canine eyes react to exposure to light differently than human eyes because dogs (along with cats and many other animals) possess a light-reflecting surface known as the tapetum lucidum, located between the optic nerve and the retina. It operates like a mirror, reflecting the light and allowing the rods and cones another opportunity to pick up the limited amount of light available at night..." Source: http://www.vetstreet.com/our-pet-experts/why-do-my...
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