OSTRICH Plume Natural gray OST-00 Please note not all the plumes have the tips length apx 12 inches qty 1 Ostrich provides many qualities desirable in fly tying. The herls are often used to dress butts on Atlantic salmon flies. Ostrich herl can be tied onto patterns as a tail in place of Marabou. The herl produces a life-like movement underwater. It can also be used to imitate the delicate gills of nymphs.