This episode examines the deserts of Australia's interior. These harsh environments make up two thirds of the land area. Vast areas support nothing but tough spinifex grass, indigestible to most herbivores.
The third instalment features the wildlife of Australasia's seas and coasts. On Western Australia's desert coastline, seas are lifeless apart from a few fertile pockets.
The final instalment explores man's impact on Australia's wildlife. The arrival of Europeans brought huge changes. Some creatures have benefited - golf courses provide perfect browse for kangaroos and a landfill site is an important feeding ground for ibises - but many have suffered.
