This fly is a scaled down version of Duck's Green Drake (For background information on how the fly was named please see the June 18, 2012 Fly of the Week.) It was recently tied to fish the tiny fall Baetis hatch on my home water in Northern Idaho. It isn't quite as small as the naturals, but it has been very productive fishing to both trout regularly rising to naturals and those lurking until a natural comes along.