Kangaroos, koalas, and opossums, oh my Most marsupials live in Australia, but a few are here in the U.S. Find out how these fascinating and unusual "other" mammals evolved and live.Kangaroos, koalas, and opossums, oh my Most marsupials live in Australia, but a few are here in the U.S. Find out how these fascinating and unusual "other" mammals evolved and live.