How do endotherms stay warm?
Rate of metabolism is related with energy released from body.
All endothermic animals like birds and mammals keep their body temperature constant. Birds are having maximum rate of metabolism. Their body temperature is roughly 40 degrees Celsius. Mammals keep body temperature constant with the same mechanism. Mammals eat more . Most of the food is used for generating heat. This makes them independent of temperature fluctuations of environment. Human temperature is constant at 37.5 degrees Celsius.