If this doesn't kill you, it will, at least, drastically reduce the concentration of dissolved substances in your blood. Ectotherms can generally be active over a wider range of temperatures than endotherms can. Ectotherms can devote a larger portion of their energy to growth than endotherms can. Ectotherms are more able to reduce their metabolism during times of low food availability. Ectotherms do not have a heat-related lower size limit.
Ectotherms can generally survive better in resource-poor environments.
Many of the cooling mechanisms that mammals employ involve increasing the metabolism. Increasing the metabolism can increase the heat of the body even more. This can quickly lead to death from a situation called hyperthermia. Brown adipose tissue is an important thermoregulatory adaptation in some mammals. The placement of the veins and arteries in this tissue minimizes heat loss to the environment.