system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Warm-Bloodedness and Cold-Bloodedness in animals.

What's the difference? Why is being warm-blooded / cold-blooded beneficial to the animal?
gpt
Warm-bloodedness means that the animal makes its own body temperature. This is beneficial because it means that the animal can happily live in cold places and places with fluctuating temperatures, and can be more active for longer than a cold-blooded animal, as long as it can get enough food for fuel. It's a disadvantage because it means that the animal needs to eat a lot more food than a cold-blooded animal. Mammals and birds are all warm-blooded-- they usually have to eat many times every day, but can live nearly anywhere on earth.

A cold-blooded animal gets most of its body heat from outside of its body, like by soaking up the sun. This is beneficial for the animal because it has to eat a whole lot less than a warm-blooded animal, but the downside is that it has to find that external heat regularly to keep itself going. Reptiles are cold-blooded-- they can go for months without eating, but can only live where it gets warm enough often enough.