Those eerie shining orbs staring at you from the bushes when you take the trash out at night could be any number of animals, but why do their eyes glow like that?

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Sources:
https://www.ncbi.nlm.nih.gov/pubmed/14738502
http://onlinelibrary.wiley.com/doi/10.1111/j.1463-5224.2004.00318.x/abstract
https://www.ncbi.nlm.nih.gov/books/NBK10848/
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html
http://www.npr.org/templates/story/story.php?storyId=96414364
https://www.ncbi.nlm.nih.gov/pubmed/7386574
http://www.vetstreet.com/our-pet-experts/why-do-my-cats-eyes-glow-in-the-dark
http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0264.1986.tb00713.x/full
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Images:
Alligator Eyeshine
https://commons.wikimedia.org/wiki/File:Gambian_epauletted_fruit_bat_(Epomophorus_gambianus).jpg
https://commons.wikimedia.org/wiki/File:Black-Lab-3-months-old-puppy.jpg
https://www.flickr.com/photos/13316988@N00/2607304048/

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Why Do Cat Eyes Glow in the Dark?

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