my only difference in
opinion (and point) is that they are ONLY more suseptable, not more sensitive.
and just to throw more out onto the table:
[From memory from one of my physio lecture two years ago:]
Thermoregulation of the human body (pregnant or not) includes apendicular and core temperatures. 98.7F is actually not your true "core" temperature, however under the tongue and rectally brings you as close to the 100-101 true core temperature. Think of the heart as being the center of your "core" temperature. When you were pregnant (even when you're not) and it was really hot out your body thermoregulates your internal organs, cools them, by increasing the diameter of the vessels in your body and extending the "core temperature area" outward toward your arms and legs making them closer to the 100ish your core normally is. When it is cold out your vessels will get smaller so most of your blood stays in the body cavity (where it can't get made colder) and your body core area shrinks. In both cases your body core temperature is not changing despite environmental temperature extremes. Deviations in the actual body core temperature are known as hypothermia and hyperthermia and result in the denaturation of cellular proteins (why running high temperatures are very dangerous), and death.
The embryo is placed within the core temperature area of the body where the temperature never varies more than 5 degree's. I'm not sure about snake development but I know that the first 4-8 weeks of human development require extremely stable and healthy environmental conditions to prevent defects (i.e. embryo is most suseptible).
In contrast to this maximal 5F differential, corn snake eggs regularly experience day/night temperature fluxuations of 10 ore more degree's F (65F at night and up to 85F during the day in early spring late fall in the south).
Suseptible yes, sensitive no...
and just so you don't think I'm talking out of my ass
here