How do wallabies survive in winter?

There are a couple of methods koalas use to keep cool. Firstly, because the eucalyptus leaves they chew give them very little energy and require a lot of energy to digest, koalas restrict their movement to a minimum.

However, their main method for keeping cool is by spreading out in the high branches of eucalyptus trees. This serves two purposes. It helps to open up their thick, insulating fur to allow the escape of heat from their bodies. Secondly, scientific research using infrared sensing has shown that koalas seek out the cooler parts of trees. They drape their bodies over these parts, extending their limbs and allowing them to hang down either side, thereby exposing their bodies to as much of the coolness as possible.

They do not readily swim if they can avoid it.