Koalas are solitary and stay in one location or even one personal tree
A male koala’s territory may be relatively small or measured in kilometres - and they will move throughout their home range. Koalas also form social groups which may include a dominant male, one or more females, joeys and sub adults.. Every year these young male koalas “disperse” in search of their own territory. Adult koalas are also quite mobile during breeding season (putting them at significant risk from drivers and dogs).
Important fact: A koala which remains on the ground or even in the same tree for more than a few days should be reported (1-300-Animal is a good first call). The koala may be suffering from injury or disease and the sooner it is brought into care the better outcome.