Birds have two eyelids, upper and lower, but they also have a translucent nictitating membrane, sometimes called a “third eyelid”. This membrane closes across the eye from front to back, as you can see with Griffin here. It is used to moisten and clean the cornea, especially in flight. It is also drawn across the eye when there is a chance the eye might be scratched or damaged by activities like flying through brush or feeding their young. Macaws have such beautiful eyes. Like an endless tunnel.
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Bald Eagles have a transparent third eyelid, an inner eyelid, called the nictitating membrane. It sweeps across the eye and keeps it moist and clean while allowing them to see. They also use this eyelid to protect their eyes when they're tearing up prey or preening their face with their talons. We snapped these photos from the Wildlife Drive. | Friends of Blackwater NWR
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