Most fly fishermen equate Blue-winged Olives with Baetis mayflies (left). The natural's gray-olive body and blue-gray wings give it its common name. Caucci and Nastasi's olive Compara-dun (top left) and the Swisher/Richards No-hackle Dun (top right) are both good fly choices during a hatch. (Main image: Ted Fauceglia; inset images: John Randolph)