This picture was taken by Abbott Thayer who was an artist and a pioneer of camouflage. Apparently there are two ducks on this image, one is counter shaded. It seems to work so well that I can't see the right one at all. If anyone can see it. please draw around the contours and reupload it (for example on pixentral.com), please.
http://upload.wikimedia.org/wikipedi...tershading.jpg
Thanks!