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

Describes the mating rituals and reproductive methods of a variety of animals, including flatworms, jellyfish, chameleons, and walruses.

Provides information about the ancient reptiles who dominated the seas during the Mesozoic era, over 200 million years ago, discussing their origin, different types, and mysterious extinction.