David Attenborough explores the grasslands of the Americas, Eurasia and Africa, and encounters the rare maned wolf, a giant anteater, bison, prairie chickens, Russian antelopes and more. In the Sudan hewitnesses the Merle tribe hunting amongst the spectacular migration of a million white-eared kob antelope.

High above Earth's surface David Attenborough floats weightless, showing that without gravity the world would be a chaotic place. Seen from space huge cloud patterns sweep across the globe. But some species like spiders, ski-diving frogs, gliding squirrels, birds and bats have overcome the force of gravity to fly through the air.