👉 Ectothermic refers to organisms that are not capable of generating their own heat through physical processes. This means that they require energy from external sources, such as sunlight or water vapor, in order to maintain their body temperature. For example, a mammal, like a bear, would be ectothermic because it relies on the sun's rays to warm itself up and survive. On the other hand, an animal such as a bird, which is not capable of generating its own heat through physical