Sweating, or perspiration, is a normal phenomenon in Humans. The evaporation of the water from the skin takes heat away from the body and so sweating is essential for temperature control.

In the animal kingdom, we find that humans are the smallest animals that sweat. Larger animals, such as elephants, depend on sweating as well as other behavioural patterns to control their temperature. Smaller animal, such as dogs, cannot sweat and as such have to lose heat in other ways – for example dogs get rid of heat by panting. In panting it is the evaporation of the water off of the dog's tongue that cools the blood in dog's tongue which then circulates and cools the dog.