Most sharks cannot move their upper and lower eyelids, but they often choose to rotate their eyes backwards for protection as they feed. However, some species of shark possess a third eyelid called a ‘nictating membrane.’
This membrane shields the eyes completely, which seems a nice alternative to rolling their eyes back and not being able to see!
This membrane shields the eyes completely, which seems a nice alternative to rolling their eyes back and not being able to see!
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