15th Annual Smithsonian Magazine Photo Contest Natural World
Nictitating Membrane

Eagles have 3 eyelids. The third one, the nictitating membrane acts like a windshield wiper and protects their eyes.

Photo Detail
Date Taken: 04.2017
Date Uploaded: 08.2017
Photo Location: Apopka, Florida, United States of America
Camera: NIKON D5300
Copyright: © Mary Koutsakis