Koala joeys stay with their mother until the mother's next breeding season. This is usually when the joey is around twelve months old.
No.
Koalas need others of their own species for a population to thrive, not only for obvious reproductive reasons, but because they do require the company of other koalas.
Koalas can really only survive independently of their mothers at about twelve months old.
Koalas stay with their mother for about a year, until the following year's breeding season.
Koalas only go though a stage of dormancy or hibernation during their embryo state. In adulthood Koalas do no hibernate.
Koalas are social animals within their own species. The animals have few predators. Among the animals that will hunt and eat koalas are dingo's, owls, eaglets, and pythons.
It is illegal to own pet koalas, though it is possible to volunteer to foster one. In that case, you basically can care for the koala in whole.
Koalas regularly go on the ground. Koalas do not spend their entire lives in a single tree. They have a home range which may extend up to a kilometre squared in size, so they need to go on the ground in order to move between their home trees.
Koalas do not put their babies anywhere. The young joey crawls there on its own immediately after birth, and remains there for at least six to seven months.
Koalas stay in their eucalyptus trees. Their thick fur is partially waterproof, although it does not protect them in a particularly heavy downpour.
Adult koalas are simply called koalas.
Koalas usually mind their own business. Their behaviour is neither 'good' not 'bad', but typical of wild animals. Makes become more aggressive around mating season, but generally, koalas are placid animals which avoid encounters with people.