A look at one of the most famous habitats on the planet, the Serengeti in East Africa, a vast grassland that is home to some of the greatest concentrations of herbivores on the continent. But what is the key to this exceptional grassland that allows such density and diversity?
As temperatures hit minus 60 food becomes scarce, and animals such as foxes and hares shed their colourful coats to camouflage themselves in the snow. The end of winter heralds one of the world's greatest feeding frenzies as large ocean predators target the millions of fish who have found refuge in the Gulf of Alaska.
Much of Australia consists of vast tracts of uninhabited land, a perfect hunting ground for the country's imperious birds of prey. From the brown falcons that feed on the country's deadliest snakes, to eagles that have been known to start fires on purpose so they can hunt fleeing animals, soar above the diverse habitats of this island continent in the company of its most accomplished aerial predators.
Visits the world's deepest valley: the Kali Gandaki river in the Himalayas. Its temperatures range from those of the tropics in its lower reaches to that of the poles higher up. It therefore shows how creatures become adapted to living in certain environments.