We call this fly the Killer Quill, and for good reason – when fish aren’t eating anything else, they dig skinny mayfly patterns. Super simple & effective pattern, plus it’s a quick tie. If you have picky fish eating little mayfly nymphs, this is a pattern to definitely have in your box. Brown, yellow, olive, and black are all good bets, but various other colors can work just as well. This fly might not look like much, but it’s a winner!