Elephants have big ears and they can do many different things with them. One of them is cooling themselves down when the weather is too hot. Blood flow into the ears carrying heat out of the body, and cooler blood re-enters the bloodstream, reducing the effects of heat.
By flapping their ears, elephants can reduce their body temperature by 10 degrees Fahrenheit or more. Also the wrinkles on their skin can keep the animal cool by giving heat a larger surface area through which it can be dispelled. In addition they can trap and retain moisture longer than would smooth skin, prolonging the evaporation process and allowing the animal to release up to 75% of the body heat.