Homeothermy is the ability of an organism to maintain a constant internal body temperature, regardless of external environmental conditions. This physiological trait is commonly found in mammals and birds, which are often referred to as endotherms. By regulating their body temperature, these animals can remain active and functional in a variety of climates, allowing them to thrive in diverse habitats. To achieve homeothermy, organisms utilize various mechanisms such as metabolic heat production, insulation through fur or feathers, and behavioral adaptations like seeking shade or basking in the sun. This ability is crucial for survival, as it supports essential bodily functions and enhances overall fitness in changing environments.