I saw Koala's at several different places through my journey in Australia. They are creatures that sleep a lot and eat eucalyptus when they are awake. Rumor says they actually get stoned off the plant, but the various guides assured us this was not the case.
If you look closely, you can see the baby in her pouch. The guides told us this was not common to see and to be able to see so easily with the Koala hanging out on the railing. She was actually roped off so that people could not touch her and disturb her slumber.