First, you won t stumble over one because they re up in the trees. Koalas live almost exclusively in the top branches of eucalyptus trees. All they eat are the leaves of eucalyptus trees. That s all. An adult koala eats between one and two pounds of eucalyptus leaves every day.
Koalas don t even sample anything else.
In fact, they don t even drink anything else. They get all the liquid they need from you guessed it the eucalyptus leaves. So they stay up in the top of the eucalyptus trees just eating and sleeping, eating and sleeping, night and day. But there s another reason you won t stumble on a koala as you walk through the Australian forest. All through the 20 th century the koala population has been declining because many of those eucalyptus forests have been destroyed by fire, and by the advance of civilization.