Learn about the marsupials of the world, including opossums, kangaroos, koalas and others.

Warren, a feisty little koala, is frustrated and annoyed because since the days of Captain Cook, people have called koalas bears, and he really wants everyone to know that koalas are NOT BEARS--unfortunately even Kangaroo and Platypus are not impressed by his argument.

Fifth-grader Ronnie and Ms. Lernin tour the Cenozoic Era, where they encounter three kinds of mammals--monotremes, marsupials, and placental mammals--and other animals with which they shared the Earth.