Anne Elliott's photos with the keyword: nictitating membrane

When we were at Bow Summit, Rocky Mountains, yesterday, we had a couple of Common Ravens fly down to the hood of my friend's car when we stopped. They then proceeded to try and "fly" on to the driver's side mirror, perched with a little difficulty, and happily ate some of my sandwich. You can see the nictitating membrane covering the eye temporarily, to keep it moist.

A cropped version of the next photo, to better show the blue nictitating membrane that came down over this Raven's eye. A beautiful shade of blue.