A friend of mine has two cats; a male and a female. They are left home alone quite a bit and she keeps them in the basement of her condo with all the comforts of home. The few times I have seen the cats, they prance around and act like normal cats but one thing I find strange is that both of their tails are always straight up in the air. I have had cats around and have never noticed this on any of my cats. What could this mean (if anything). She did get both of them when they were kittens from a business that takes in ferals.