The eye of the Red-eyed treefrog (Agalychnis callidryas) from Costa Rica [Canon 10D, Canon MP-E 65mm, speedlight Canon 580EX]
Like the Eye of Sauron, this eye never sleeps. The Red-eyed tree frog (Agalychnis callidryas
) from Costa Rica has the upper part of the lower eyelid translucent, allowing the frog to see its surrounding even with the eyes closed. The eyelid carries a pattern of golden lines that obscure the normally highly visible red iris of the eye.
(This image is now available as a high quality print from my new image collection.)