What an extraordinary slow-motion video by Japanese photographer Fumihiko Hirai. The video shows close-up of the nictitating membranes in action. The third eyelid protects the eye, moistening it, and may potentially aide in camouflage. This translucent or opaque membrane is also found in found in reptiles, and certain mammals.
Take your time and watch this video over and over again. Great video to use as inspiration to draw some magnificent birds with a focus on their eyes.
Biomimicry for Young Children 