Nothing at all? Minnow? Leech, but it is not the same as a leech pattern when you look at them side by side. It is just a woolly bugger, always has been, always will be. The leech patterns I've used don't get hackled, most don't have the same tail, most have a slimmer more sleek profile. I don't really know though. I'm not a trout. Trout eat them all. I'll fish them because the trout tell me they approve.