Thanks for all the responses...it certainly sounds like she has a wheelie tail; she's one of the two who do use the wheel...the other three don't bother with it, but she and her little black friend love it, which is why I put it in there. The others just kind of ignore it. I have been watching them to make sure nothing happens, but have seen no improper use of the wheel, and it's large enough for an adult rat to use.

XDD HoneyChild sounds adorable!!! Must have been so cute to watch!