The Pale Evening Dun spinner fall is some of the most exiting dry fly fishing there is. Mating occurs near sunset when they flock in very large numbers to the river. After mating they fall dead to the water causing even the largest trout to surface. While fishing, try to imitate this falling fly action by dropping the fly on to or just in front of holding water and let it drift. The sheer quantities of this fly mean when they are mating the trout are almost always feeding.