Chimpanzees are endothermic. Endothermic animals make their own heat. The heat they produce inside their bodies comes from energy from food. An endothermic animal’s body engine works hard to keep its body the right temperature for activity all the time. When the outside temperature is too hot, an endothermic animal can cool off by sweating or panting. The cost an endothermic animal pays for this inside body heat system is that it must eat much more often than an ectothermic animal.