A list of warm-blooded animals would include all mammals and birds (with very few exceptions), such as apes, monkeys, whales, elephants, cheetahs, giraffes, dogs, cats, pigs and humans. All reptiles, amphibians, fish and insects are considered cold-blooded.

Studies have shown that dinosaurs were not warm-blooded or cold-blooded, but had both cold-blooded and warm-blooded features with complex metabolic systems. Bats, mole rats and echidnas are also considered to be neither cold-blooded nor warm-blooded due to their varying temperatures.

Warm-blooded animals work to keep their body within a stable temperature range. For this to happen, these warm-blooded animals will work to generate heat in cool environments and then subsequently cool themselves whenever they are in hot environments. The energy to create the heat comes from the food that the warm-blooded animals eat. An example of a warm-blooded animal attempting to cool itself down would be a dog panting.

Cold-blooded animals by contrast will have the same temperature as the environment that they are in. If the environment is cold, then the animal will be cold. These animals change their behavior based on their environment because of their cold-blooded nature. Whenever they are in a cold area, they will move slowly, while in hot areas, they will move quickly.