Warm-blooded animals maintain thermal homeostasis; that is, they keep their body temperature at a constant level. This involves the ability to cool down or produce more body heat. Warm-blooded animals mainly control their body temperature by regulating their metabolic rates (for example increasing their metabolic rate as the surrounding temperature begins to decrease). Both the terms "warm-blooded" and "cold-blooded" have fallen out of favor with scientists, because of the vagueness of the terms… (More on Homeothermic)