On the mountain road, there are two dogs playfully chasing each other. One of the dogs is large, skinny, and tall. Its tail is abnormally long and thin, almost double the size of its body. Even more unusual is that its tail does not come out from its behind, but its back from about a third of the distance of the spine measured from the head. Observing more closely, I discover that that tail is not that dog’s own tail. On its back, there are a few small, squirrel-like animals. That tail belongs to one of those animals.