My girl and boys spine are prominent but not skinny and far out there. I could be horribly wrong about this considering it's what I've been going off of for a long time, but I'm sure you want to be able to see the spine unlike BP's.
I'll have to do some double checking now that I'm doubting myself. I'm always worried about mine turning into those HUMONGOUS giant sausage snakes everyone always so proudly posts on forums. I think it's sorta disgusting they let the animal get so fat. With such aggressive feeding responses, I sometimes wonder myself if I'm not feeding my girl enough... but she's doing well so far and looks healthy. I'd rather her grow slow and develop well with no huge fat stores than turn into a sausage snake.
I absolutely love this picture from redpython.net, BC's site. I think it is a FANTASTIC example of the body your should aim for with these snakes, especially when they get so fat so easily.
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