I used to get litters now and then with a few babies that had really wild bent tails with dozens of 90 degree kinks in them, I'm sure it was genetic somehow. Didn't look real desirable though and I never held any back and usually fed them off first. I haven't seen any now in my collection for a few years. Maybe I should have offered them to someone to work with, but I'm not sure it really would have been considered a desirable trait worthy of being passed on.