Woolly Worm Olive - Worm. The Olive Woolly Worm is a renowned fly among the anglers of the world, sometimes what is needed is just simplicity to catch a multitude of fish, the Olive Wooly Worm embodies this simplicity brilliantly. This fly is the benchmark to all buggers and leeches, and the results it provides demonstrates this entirely. The Wooly Worm Olive can be used to catch every freshwater fish imaginable. This fly can be used all over North America and Canada, From Alaska to Florida in the States and British Columbia to Newfoundland in Canada.