Hawk's blank eyes

[Bill M]

I have wondered why the eyes of hawks in some of my hawk photos appear to be blank/lifeless like #2 shot in this thread. I think this may explain why. Pretty cool video.

[ame="http://www.youtube.com/watch?v=dgh6ABfdlAU"]Hawk, transparent eyelids (nicitating membrane slow motion) - best on Youtube! - YouTube[/ame]