One would think that the loreal pits on the snake just pick up the surface temperature whether or not the inside is warm. Infrared radiation is what is detected by the pits and it is at a long enough of a wavelength that it wouldn't readily pass through layers of connective tissues, flesh, etc and that the heat signature from the inside of the animal would not be directly seen by the snake. Rather the snake would see the heating of the skin from the heat being conducted from the warm insides. I'm not doubting your technique. It just seems that some animals are quirky and like to be fed differently.

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