Is a box jellyfish endothermic or ectothermic?

Ectothermic animals, also called cold-blooded animals, rely on their external environment to regulate their internal body temperature. Their body temperature is therefore influenced by the temperature of their surroundings. Box jellyfish are ectothermic, meaning they rely on external sources of heat, such as the sun or warm water, to maintain their body temperature. As a result, their internal body temperature fluctuates depending on the ambient temperature.