Cool thing about Carpets is that it really depends on their cage temperatures and sizes. Larger size enclosures will produce very trim and lean snakes that can eat more often. Carpets kept in tubs, generally get obese with weekly feedings. . .
likewise, snakes kept in lower temperatures will digest food at a much slower rate, these snakes grow slower and digest slower and will become overweight if you feed them on a weekly basis (it's unhealthy all around in these conditions though).
I have 2 Jungle Carpets in some CB-70, and they do GREAT on weekly feedings simply because they get pulled out often, and have very strict temperature controls, plus I strongly monitor their weight, and skip feedings if they still have a lump or failed to produce feces. You really do HAVE to gauge it.
All the rest of my carpets, especially my larger coastals, are kept in PVC Display cages, 3x2x2, with perching, and RHP heating. They get fed much larger meals than the Tub snakes, and they keep their weight very well trimmed and I never seem to worry about them becoming obese.
As far as food size goes . . . it is amazing how large of a meal they take. I have a 4 foot female that is already pounding medium rats, and she's pretty slender! but she never has issues taking it. I have a 3' Caramel Male that took a small rat this week to give him a new challenge, and he handled it great.
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