James Dorman

Tasmania lies on the Australian continent, but is a world apart. It is home to an extraordinary cast of black devils and white wallabies. Trees here tower to one hundred metres and green lights dance in the southern sky. As the last landfall heading south before Antarctica, Tasmania's isolation, cooler climate and distinct seasons influence everything.

This documentary follows the lives and hardships of several cougars (mountain lions) which have been under study by the Teton Cougar Project since 2000.

Sir David Attenborough takes a look at the potentially devastating impact of climate change.