The Koala site: http://www.thekoala.com/koala

The Koala What is a koala? The koala is a small bear-like, tree-dwelling, herbivorous marsupial which averages about 9kg (20lb) in weight. It's fur is thick and usually ash grey with a tinge of brown in places. The koala gets it's name from an ancient Aboriginal word meaning "no drink" because it receives over 90% of it's hydration from the Eucalyptus leaves (also known as gum leaves) it eats, and only drinks when ill or times …

…been moved to areas where they were not native or where there is not enough habitat to support them (such as on some islands off Victoria and Kangaroo Island in South Australia), problems with overpopulation have arisen because of this unnatural situation. However, this is not the case in most mainland populations, and indeed many of the mainland colonies are in decline. Koalas also suffer from a range of cancers like leukemia and skin cancers.