for those that want to see a nictitating membrane

[mockcherry]

Sorry it's not entirely clear, but you can see it...

regular eye

eye with nictitating membrane

 

[chicken_china_mom]

My chickens have gotten to the point where when they see me coming with the camera, that membrane automatically covers their eyes, lol, even when I DON'T flash the light! It's funny watching them, it's like the equivalent of them flinching!

 

[theoldchick]

Good shot!