Suriname boa constrictors are much more prone to regurgitation than boa imperator. They should not be fed prey items that are any larger than the thickest part of their body. Nor should they be fed as often as most people feed. Their organs like most constrictors swell during digestion and take sometimes two weeks or more to return back to normal. When my Suriname was 54 in she was eating medium rats and while small is fine and she could eat medium, a 54-in BC should not be eating a large. My 63 in BC just got switched to large and I switched back because I wasn't comfortable with the size. A boa imperator you have more wiggle room but with Suriname and Guyana and other BC you do not want to feed anything bigger than the thickest part of their body.