endothermia
Endothermia, or endothermia, is a physiological strategy in which an organism maintains a stable, relatively high core body temperature through internal heat production and regulation. In animals, endothermia is most closely associated with birds and mammals, which typically sustain body temperatures well above the surrounding environment. Some species outside these groups exhibit regional endothermy, in which heat production is localized to specific organs or limbs to enhance performance.
Endothermia relies on metabolic heat generated by cellular respiration and on regulatory mechanisms that minimize heat
Birds and mammals are the most widespread endothermic groups. Regional endothermy is observed in certain fishes,
Evolutionary perspectives on endothermy suggest multiple origins and varying degrees of thermoregulation among lineages. The trait