Woolly Bugger Brown - Bugger. Resembling a wide variety of aquatic life the Brown Wooly Bugger does a fantastic job at imitating the leech, which belongs to the phylum Annelida, and the class Hirundinea. Fish this with the technique of the day and Brown Woolly Bugger is guaranteed to pull those pesky trout from their holes in the river bed. It is a fly many Missouri fly fisherman live by.