Body temperature is controlled by homeostasis. There are two main ways in which this can be achieved:

• mammals and birds create their own heat and are known as endotherms
• other animals rely on their surroundings for heat and are known as ectotherms

——————————————————

Endotherms

Mammals and birds are able to maintain a very good constant body temperature by creating heat internally and keeping it in via thermal insulation. In nearly all mammals the set point is 37.5