The Koala is a small marsupial native to Australia. They have a distinctive round face with large fluffy ears and a flat nose. Their thick grey fur provides insulation against heat and cold. Koalas are arboreal and spend most of their time sleeping in eucalyptus trees, which also make up their diet. They have a unique digestive system that allows them to break down the toxic eucalyptus leaves. Koalas are often seen as cute and cuddly, but in the wild they can be solitary and territorial animals.