Pine Squirrel Leech - Black - Crawdad Orange - Natural - Sculpin Olive The Pine Squirrel Leech is a unique pattern and is one of our most popular flies! It&'; simple and durable, it will attract strikes in every season. The Pine Squirrel Leech is a popular fly pattern that imitates a leech, a small aquatic worm that is a common food source for trout and other fish. The fly is tied with a simple yet effective design, and it is available in a variety of colors, including black, crawdad orange, natural, and sculpin olive. There are four colors available: Black, Crawdad Orange, Natural & Sculpin Olive. Available in size # 8 - # 12