Gary Borger noted "Parachute Adams would be the worlds most versatile and universal fly and most of anglers think of it as a dun imitation but in reality it is an emerger". So I modified my own Pheasant Tail Mayfly Cripple into a parachute pattern. It turned out to be another good looking fly for both human and trout eyes. It works from big rivers like Madison and Yellowstone to spring creeks in Paradise Valley. Also it can be tied in many different species of mayflies by simply changing hook sizes and dubbing color (see the chart below).