More than anywhere, the Serengeti is synonymous with wilderness and has even come to represent Africa. But the story of the Serengeti is just as much about humans as it is about wildlife.

As the world's first national park, Yellowstone has long served as a model for the protection of wilderness around the world. For Americans it has become a source of great national pride, not least because it encapsulates all our popular notions of what a wilderness should be - vast, uninhabited, with spectacular scenery and teeming with wildlife.

The Amazon rainforest is the epitome of a last great wilderness under threat from modern man. It has become an international cause celebre for environmentalists as powerful agricultural and industrial interests bent on felling trees encroach ever deeper into virgin forest. But the latest evidence suggests that the Amazon is not what it seems.

About 20 million years before the appearance of the first dinosaurs, the biggest extinction the world had ever known had occurred. Towards the end of the Triassic, 220 million years ago, there was another extinction, which wiped out many of the non-dinosaurs including the dicynodonts such as Placerias and primitive archosaurs such as Postosuchus. It was after this that dinosaurs really started to radiate and diversify.

The earliest dinosaurs were pretty small. Eoraptor was only about 1 m long. However the plant-eating prosauropod, Plateosaurus, that appeared at the end of the Triassic period, was a harbinger of things to come.

While dinosaurs were ruling on land, the sea was the dominion of an entirely different group of animals: the marine reptiles. The programme concentrates on these amazing creatures that were every bit as awesome as their counterparts on land.

This episode is set in the early Cretaceous, a time when the world’s continents were breaking apart. It follows an enormous journey made by a giant pterosaur and many different geographical regions are covered in the programme.

Ancient, dramatic and full of bizarre animals, Australia is like no other place on earth. Wild Down Under explores the extraordinary landscapes and breathtaking array of strange and often dangerous wildlife that lives around this beautiful continent.

Sir David Attenborough explores the wildlife of his London hometown, from urban deer to rooftop peregrines and many others, revealing how nature thrives in the world’s greenest major city.

In this episode, Brian travels around Australia to explore the physics of the size of life. Beginning with the largest organisms on our planet, a forest of giant eucalyptus trees, he then takes to the seas to get up-close with an ocean giant - the great white shark.

A natural history portrait of a year in Yellowstone, following the fortunes of America's wildlife icons as they face the challenges of one of the most extraordinary wildernesses on Earth.