But this lizard is not found so far north, and so does not go as deep underground and does not pass the winter in masses. Students will enjoy learning more about this subject. Some recent paleontological discoveries which suggest that dinosaurs were endothermic are presented. Ectothermy and endothermy are contrasted, along with facultative heterothermy and hypothermia, from physiological and behavioral perspectives. 22 slides and guide.
Most reptiles feel cold to our touch, while mammals and birds often feel warm.
But these are subjective and inaccurate evaluations and, as such, are avoided by scientists. The body temperature of poikilotherms is relatively variable, while that of homeotherms is relatively constant. Even more useful terms are ectothermic and endothermic, which suggest two different mechanisms of thermoregulation. Ectotherms generally obtain heat from their external environment. Their body temperature varies, corresponding at any time with the temperature of their external environment.