The Chubby Chernobyl as was designed to be fished as an attractor pattern, which means it might appear to the trout as any number of different food organisms, such as a grass hopper, a stonefly, a cricket, a large beetle, bee, or your neighbor's favorite kitten. To me it looks like a tiny skate board with legs. It does appear that trout on the Deschutes think that it looks very much like a golden stonefly, so much so that the Chubby has replaced the Norm Wood Special as the go-to "searching-fly" with many anglers. There are several reasons for this fly's popularity. It floats low, like a real stonefly, and this makes it very hard to tell from the real live critter. It floats forever, with or without dressing. It is extremely easy to see in all light conditions therefore it is easy to control all aspects of your presentation. The origin of this pattern is claimed by several tiers.