Koalas are well known for their fuzzy ears, cute noses, eucalyptus diet, and of course their penchant for hugging trees. According to these scientists, this behavior does more than just keep the koalas from falling out of the tree. By tracking the position of koalas over many days, they found that on the hottest days, koalas snuggle up on trees with low internal temperatures. They calculate that this behavior significantly reduces the koala’s need to cool off by sweating. How cool is that?