A koala's life seems quite solitary. Apart from when they mate or when a mother has a baby koala they seem to spend most of their lives by themselves, sleeping, eating, moving from tree to tree in their range, not socialising at all. They avoid humans when they can; they're very cautious except, it seems, when they're climbing along, what to us would look like, twigs but they always appear to know the limits of whatever they're climbing. They're remarkably agile for what look like bulky animals but it's mainly fur and they're little balls of muscle under that fuzzy exterior. And note those claws which they seldom use in anger but they can hang on to branches in ways we would never attempt.
This koala (which we think is female) was walking along our side fence at dusk - quite a remarkable feat in itself. Then she hopped up a tree and went out on a branch which seemed far too small for her weight. After some swaying in the evening breeze, even she thought that her choice of branch wasn't optimum and she eventually descended, continued her journey along the fenceline and disappeared over the back fence.