00:00Scientists can't explain how this animal does this.
00:03Dogs have a third eyelid that most people never see.
00:07Watch Eowyn and Adis play in the yard, completely unaware of their own biology.
00:11That membrane protects their eyes during rough play.
00:14It slides across sideways, keeping dust and debris out.
00:17Most mammals have it, but dogs use theirs constantly.
00:21Evolution gave them this hidden superpower.
00:24Nature is unreal. Follow for more.
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