I have found papers saying that they can, and papers saying that they can't.....I have also found papers that say that carpets and diamonds can't/don't use shivering shivering thermogenesis, but I have seen videos of them doing it. There are even some old papers that say ball pythons will not maternally incubate. So I think there is some really bad info out there...I have been trying to figure out how I could get my females to keep a thermometer probe in with the eggs. I would like to log the temp range of the eggs. Since we use only ambient heat, I am curious if the females are actually maintaining the egg temp above the ambient.