Normally in nature no creature has more than one tail. Not so in fiction. Any creature at all can have more than one tail, often to establish its other-worldliness. Sometimes the tails look like they might come from different creatures entirely. Usually such a creature is some form of supernatural or semi-divine spirit being, elemental or demon. Youkai especially are known for having multiple tails, the most famous of which that does is the Kitsune, which is depicted with up to nine tails. The Nekomata is another commonly portrayed multi-tailed youkai, which has the appearance of a two-tailed cat.