An article written by scientists, that I read said. Waterfowl can see colors and UV so you should use UV killer soap on hunting clothes also. That they can see color is no surprise as the brightest colored drakes are the ones favored by the hens during mating. Also I have raised many species of waterfowl over the years (since 1960) and have seen them react when I put on a different colored coat or shirt when I go in to feed them.