Good Luck. For many, the zouyu are symbols of good luck and fortune.&nbsp;The tail feather of a zouyu, freely given, can be rendered into a liquid, which produces a luck potion.&nbsp;The potion brings minor good fortune, such as finding a fruit tree when hungry or shelter when it rains, to the drinker for a day. If a tail feather is taken without the zouyu's knowledge, the potion created by the feather bestows bad luck on the drinker for a day. Such bad luck manifests as the drinker tripping over a too-perfectly-placed rock or a lightning strike felling a tree onto the drinker's path.