Cold-blooded animals, also known as ectotherms, rely on external sources of heat to regulate their body temperature. They cannot generate their own internal body heat as warm-blooded animals, or endotherms, can.
Fireflies depend on the environment to maintain a suitable body temperature for activity and survival. They are usually active during warmer nights and seek shelter or become inactive during colder temperatures. Their body temperature fluctuates with their surroundings, affecting their metabolism, behavior, and ability to fly and emit light.