Answer:
Koalas are not "playful" like kittens or puppies. They have under-developed adrenal glands, meaning they don't have a strong flight-or-flight response, and possibly lack one altogether. This means that a koala who sees a human is less likely to run away, as long as the human makes no threatening moves. When in sanctuaries or rescue centres, koalas do not tend to show a desire to play, but they do interact with their keepers.