David Attenborough visits Australia and South America to study the lives of marsupials.

David Attenborough looks at the mammals that hunt insects.

David Attenborough looks at some of the biggest predators on Earth who prey on plants.

Looking at rodents, who possess incisor teeth with chisel-sharp enamel on the front edge.

David Attenborough looks at carnivores, from arctic foxes to big cats.

David Attenborough looks at omnivores - animals that eat whatever is around at the time.