A bald eagle has two outer eyelids that close when he sleeps. To blink an eagle also has an inner eyelid that moves sideways towards the outer eye. This translucent eyelid is used to blink & clean the eye & is called a nictitating membrane. 🦅

A bald eagle has two outer eyelids that close when he sleeps. To blink an eagle also has an inner eyelid that moves sideways towards the outer eye. This translucent eyelid is used to blink & clean the eye & is called a nictitating membrane. 🦅

Photo by phsiii

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Stock photo: A bald eagle has two outer eyelids that close when he sleeps. To blink an eagle also has an inner eyelid that moves sideways towards the outer eye. This translucent eyelid is used to blink & clean the eye & is called a nictitating membrane. 🦅 was taken by phsiii .