What is the definition of Mouse Tailed?

"A mouse-tailed creature is, well, a furry beast with a tail so long, it could probably outswim a gaggle of ducks. But let's talk about the darker side. Here's an unsettling example: 'The mouse-tailed killer lurked in the shadows, its tail flicking menacingly like a zombie's side-eye, ready to pounce on unsuspecting prey.'"