I too have heard from a few ppl who use only ambient temps successfully. I personally don't think I'll ever play with it, it just worries me that they won't be capable of thermoregulation in one room of the same temp. In a heated room they have no way of cooling down and I do feel like belly heat aides in digestion. In nature there would be belly heat, as the ground would provide it and lots of different heat gradients. If they get hot they can go underground, etc.

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