I'm talking about wings on dry flies. We have hackle tips, duck feathers, deer hair divided, comparaduns, wally wings, wonder wings, poly yarn, calf hair and parachute posts in natural and odd colors. I know I missed some. Does it make any difference to a fish what the wing looks like? I believe that the wings on mayfly imitation are for the fisherman. They make us think our fly is more realistic or is easier to follow. All the fish sees is something sticking up in about the right place.