[manmal]

Body heat can't be accurately measured. You can just measure heat loss via the surface. But there's variations on the cell level. Since heat can be stored inside the body for a longer period, measuring heat loss over a short period of time is not representative.

[kragen]

you are correct, but only for cold-blooded animals like reptiles

[manmal]

Why would that be? Eg Organs are warmer than hands etc - there certainly is a gradient. The heat from metabolic processes will not become obvious immediately because it’s redistributed before it’s lost to the environment.

[kragen]

in warmblooded animals core temperature is homeostatically regulated to high precision, preventing the kind of heat storage you're talking about