To maintain their internal body temperature, animals rely on a process called thermoregulation. This physiological mechanism enables them to balance heat production and heat loss. Ectothermic animals, like reptiles, depend on external temperatures for body heat, while endothermic animals, like mammals, generate heat internally through metabolic processes. Thermoregulation involves physiological adaptations, such as perspiration in humans and shivering in birds, allowing survival across diverse environmental conditions, ensuring proper functioning of bodily systems.