Watch the full episode of the PBS Nature film which examines koala communication, vocalization, and social structure.

An interview about koala communication, vocalization, and social structure with Dr. Bill Ellis, head of The University of Queensland's Koala Ecology Group.

Information about the eucalyptus leaf-eating marsupial Phascolarctos cinereus.

A fight erupts between two koalas after one of the males invades the other's territory.

A baby koala consumes his mother's pap, a secretion that will give the joey the bacteria needed to digest eucalyptus leaves.

Cracking the Koala Code explores the day-to-day dramas of an extended family of koalas, seen through the eyes of the scientists studying their every move and vocalization. Watch a preview of the film.