Grouse and Orange - Soft Hackle. The Grouse and Orange imitates caddis pupae, in addition to mayflies, adult caddis, and even some stoneflies. Don't let the simplistic look of this fly fool you this is a deadly weapon in the right hands. The grouse hackle adds a distinct edge to this already fantastic pattern. This pattern is sure to provide results widely across North America in all the streams, ponds, lakes, and rivers, it truly doesn't matter to this incredible pattern.