Editing Endotherm (section)

===Avoiding overheating===
In [[Tropical rainforest climate|equatorial climates]] and during [[temperate climate|temperate]] summers, overheating ([[hyperthermia]]) is as great a threat as cold. In hot conditions, many warm-blooded animals increase heat loss by panting, which cools the animal by increasing water [[evaporation]] in the breath, and/or flushing, increasing the blood flow to the skin so the heat will [[radiant energy|radiate]] into the environment. Hairless and short-haired mammals, including humans and horses, also [[Perspiration|sweat]], since the evaporation of the water in sweat removes heat. Elephants keep cool by using their huge [[ear]]s like [[radiator]]s in automobiles. Their ears are thin and the [[blood vessel]]s are close to the skin, and flapping their ears to increase the airflow over them causes the blood to cool, which reduces their core body temperature when the blood moves through the rest of the circulatory system.