Animals that can maintain a constant body temperature, regardless of their environment, are known as endotherms. This group includes mammals and birds, which generate and regulate their body heat through metabolic processes and internal adaptations. Endothermy allows these animals to remain active in a variety of habitats and temperature conditions, which often facilitates survival and reproductive success. Their ability to maintain a stable internal temperature enables them to thrive in diverse ecosystems, from cold polar regions to hot deserts. In contrast, ectotherms, such as reptiles and amphibians, rely on environmental heat sources and exhibit more variable body temperatures.