 Although it is unknown what caused the mutation that gave Tails his  namesake twin appendages, the concept of a fox with two tails is  common in Japanese folklore. According to the mythology, foxes are  magical beings with the ability to shapeshift; the older a fox, or  kitsune, gets, the more powerful it becomes and the more tails it  has. Kitsune gain a new tail every hundred years until theyve  reached their maximum strength of nine tails. Theyre notoriously  mischievous, so if youre walking in the woods and happen upon a  nine