Boas are a little more "square" in the body that pythons. Pythons seem to have a more rounded shape... makes them look chunkier![]()
The boa may seem a little bloated when you hold her because she looks skinnier than a python when you aren't holding her. I'd say it's an illusion... but that's what I get from the picture. Not sure.
Did she eat a large meal in the last week or so? If they eat large meals, they tend to look a little more bloated than pythons, again due to their square shape.