As we move about from place to place, we may feel changes in the temperature around us, but we don’t expect the temperature of our body itself to change. And it doesn’t. We are classified as “homeothermic,” and in our class are included all warmblooded animals, all mammals, domestic animals, and birds.

But there are animals whose body temperature does change with the temperature around them. They are called “poikilothermic,” and they include insects, snakes, lizards, tortoises, frogs, and fishes. The temperature tends to be slightly lower than the temperature of their environment. They are only Ants animals.