BH Leech Mohair Black - Bead Head. The Beadhead Black Mohair Leech does a fantastic job of resembling a real, living leech. The Bead Head Black Mohair Leech has the obvious weighted head which gives it the correct posture while you are bring this fly in on the retrieve. The waters of North America are rather populous with leeches and they are a very popular snack for the hungry trout as they provide a rather substantial meal.