That was my train of thought but since their biology is sooo different, I thougt it strange that I had never seen it mentioned. I have always thought cold blooded meant the ability to regulate (to some extent) body temperature but there is a difference in the way lizards, snakes and frogs (and others I am sure) can almost freeze and shut down their systems but not really be impacted by extremes where others just expire if the temperature is not suitable.