Every snake in captivity can be overweight as adults. In fact I rarely see captive collections that are not mostly overweight. If you don't think that I would think you do not see enough wild snakes. I was at a guys place recently and he was complaining about another keeper's collection being fat. I looked around his animals and mentioned they were all fat too and he thought I was joking. I try to keep my animals pretty lean and I miss a breeding season here and there because of it. When I cared more about production I did keep my animals heavier but now I go lean.

Jason