Craig Mathews, who owns Blue Ribbon Flies in West Yellowstone, Montana, slightly modified the Compara-dun by replacing the hackle-fiber tails with an amber Z-lon "shuck" that represents the partially empty exoskeleton of a mayfly nymph still attached to the emerging mayfly dun. This adaptation--called the Sparkle Dun--allows you to fish three stages of the mayfly life cycle with a single fly.
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