How long can koala bears live in the us?

Koalas are not bears, to begin with. They are marsupials uniquely adapted to the flora of Australia. They live in sub-tropical to temperate eucalyptus bushland, and eat only certain types of eucalyptus leaves. They cannot live in the wild in the US.

They are unable to eat just any type of eucalyptus. While there are hundreds of different eucalyptus species in Australia, koalas eat from only about 60 of the species, consuming about half a kilogram of eucalyptus leaves every day. Koalas will not eat all types of eucalyptus, feeding on just 14 species as their primary food source, specifically, the subgenus Symphyomyrphus. These species do not occur naturally in North America.