The Swimmer Nymph: The slender bodied nymph that undulates to the surface film (as opposed to crawlers, clingers, borrowers). Blue Winged Olives generally fall into this category and are often considered, over all, one of the more important mayfly species to learn about. Below, Pheasant Tail fibers are an excellent material to help represent that slender, swimming body. It was also used here for the wing case and gives that fuzzy effect. The Pheasant Tail fibers were run back over the top of the abdomen and extended into the tail. I wrapped the wire ribbing forward over the top of the pheasant tail pieces to secure them (Skip Nymph technique for back strap over abdomen). Some, in a more exacting style, would opt for fewer pheasant tail fibers, say 3, in an attempt for matching the natural image (3 tails).