Instead of "exothermic organism", you might be thinking of ectotherms, which are animals that rely on external sources of heat to regulate their body temperature. Some examples of ectotherms include:
* Reptiles: Lizards, snakes, turtles, and crocodiles.
* Amphibians: Frogs, toads, salamanders, and newts.
* Fish: Most fish are ectotherms.
* Insects: All insects are ectotherms.
These animals often sunbathe or find shaded areas to adjust their body temperature. They are commonly referred to as "cold-blooded" animals, but this term is not scientifically accurate, as their blood temperature can fluctuate.
It's important to note that endotherms are animals that regulate their body temperature internally through metabolic processes, like humans and mammals. They are often referred to as "warm-blooded" animals.
