My spider breeder has some slight head wobble and will corkscrew at times, but rarely misses food and eats live. I have others who miss as often or more and aren't spiders and don't wobble. He would breed a rope if you put him in with it, add to that he eats anything I throw at him, ASF, mice, rats and either live or F/T. Plus he is the most curious, responsive ball I own. Of all of them he loves to be held and loves to explore. His offspring have exibited minimal wobble and one out of 3 spider babies corkscrewed but all ate live ravenously. It seems to me that it is more often the males that are the more extreme examples of this "defect" Anyone else think there might be something to this?