EndothermicIn biology, an endothermic organism is one that maintains a constant body temperature. The organism, typically a mammal or bird, does this by generating its own heat through metabolism. Endotherms also expend a great deal of energy in order not to overheat. To avoid overheating, an organism may pant, sweat, lick, or seek shelter or water.
In chemistry, an endothermic reaction is one that that requires heat to break the bonds of the reactants.