Hare&';s Ear - Olive Olive can be a great Mayfly larvae imitation. Available in sizes: # 08 - # 20.The Gold Rib Hare&';s Ear is one of the mostly widely used nymphs when fly fishing. The olive dubbing in this fly adds another dimension to your options out of your fly box. Often taken for an Olive Mayfly larvae, this pattern can be very effective. Sizes: #12 - #20