Thanks for the comments. I have been studying maternal incubation in various species of pythons since the late 1970's. It is an amazing physiological process carried out by a true poikilothermic animal. The most amazing are the larger python species which physiologically thermoregulate to an incredible degree of accuracy and can maintain this accuracy even when ambient background temps drop by 10 degrees or more. Below are a couple of photos I've taken over the years of some of my females on eggs. The upper photo is one of my first and is a burmese from around 1980, and the lower photo is a Sri Lanka python.

Kelly

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