Some have a slight head wobble, some roll their entire bodies in circles. You never know. Some can appear to be very slightly affected as hatchlings and turn into train wrecks down the line or vice-versa. Some people believe there are spiders that don't wobble, but I think it is becoming more and more accepted by big breeders and home breeders that they are all at least a little tweaked. I personally won't breed or keep them. There are TONS of previous posts on the subject if you do a search.