Cooper's hawk with one nictitating membrane down and the other eye normal.

Crow showing a nictitating membrane while eating a peanut.

Okay... I realized after I placed this photo that they aren't showing their nictitating membranes, but it's weird enough anyway.

How about #CyborgEyeSunday. Birds who are displaying their nictitating membranes. #nikon #eck #maryland #wildlife #birds 📷🪶