"Where I come from my kind are relatively common. A birth defect in a single nine tailed fox led to dominant tail genes overpowering recessive tail genes in normal foxes and creating...more of a throwback than a mutation. That's the science in a nutshell. The story goes that a powerful fox Mage delved into every type of dark art there was. Apparently it started out as study but of course he went mad along the way. He started abiding his powers to impress, then to influence, and finally to destroy. In pursuit if his ideals this mad fox supposedly absorbed his chosen mate - a black cat Anthro - and each of her nine lives became a tail. They say that the fusion also created a child from the fox's original tail which fell off and became the ninth life - the dominant life. Convenient really, otherwise supposedly we'd all have ten tails. Anyway, the mad fox ran off to some magical land or another to study evil for all eternity whilst his son grew up to be a nine tailed fix as well. The son apparently found his fathers notes and became a demon lord, amassing a huge army of demon to take vengeance upon the world for chasing his father away. The rest is kinda lost on me, but my kind - one tailed foxes - always breed and christen after chasing feral and Anthro felines alike far, far away."