Assertion: shark's eyelid | /r/CapableOf | cover the eye
Facets:
Source sentences:
text: Sharks do not have moveable upper or lower eyelids, but the tiger shark—among other sharks—has a nictitating membrane, a clear eyelid that can cover the eye.
text: Porbeagle Sharks have a third eyelid, also known as a nictitating membrane, that protects their eyes.