Today's cool fact is...
"Dogs have three eyelids. The third lid, called a nictitating membrane or “haw,” keeps the eye lubricated and protected."
Fact from: http://facts.randomhistory.com/2009/02/15_dogs.html
Pic from: https://s3.amazonaws.com/objects.artspan.com/member/pixellle/500/187487.jpg
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