it. Normal body temperature is around 37 °C (98.6 °F), and hypothermia sets in when the core body temperature gets lower than 35 °C. Usually caused by prolonged exposure to cold temperatures, hypothermia is usually treated by methods that attempt to raise the body temperature back to a normal range.

It was not until the introduction of thermometers that any exact data on the temperature of animals could be obtained. It was then found that local differences were present, since heat production