Many of the animals featured in the Planet Earth series are endangered so do we face an extinction crisis? Saving Species asks the experts if there really is a problem, looks at the reasons behind the declining numbers of particular animals and questions how we choose which species we want to conserve.

Pollution, climate change and a growing human population are all putting pressure on Earth's wildernesses including the Bialowieza forest, the Gobi Desert and the Arctic tundra. So how much of the planet is still wilderness? And why should we care? Into the Wilderness explores why these uninhabited expanses are important for our survival as well as that of all creatures on the planet.

This history of conservation throws up some interesting ideas as we look to the future of an ever more populated planet. How can conservation fit into this new world driven by economics and development? Living Together looks at the challenges facing conservation in the 21st century and looks at the role of religion in piloting a moral and ethical approach to the world we live in.

The making of the sprawling, ambitious series is documented.

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Originally aired under BBC Natural World Collection. Many years ago lions thrived in the deserts of Namibia's Skeleton Coast, until they were exterminated by man. Six years ago maverick biologist Flip Stander discovered a tiny remnant population alive and well in nearby mountains, and started to study them. Their numbers have grown and they are now returning to the desert in increasing numbers. But if these lions are to continue roaming here, Flip will have to persuade local people that these lions are worth more alive than dead.

Originally aired under BBC Natural World Collection. The BBC Natural History Unit explores a secret cave deep in the mountains of Pakistan where generations of snow leopards return each year to raise their young.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

The Planet Earth team reveal their most memorable moments from the making of the series. We'll discover their high points, and their not so high points. And they'll tell us which sequences they consider to be their great Planet Earth moments. From the

The freshwater pools that dot Mexico's Yucatan peninsula were believed by the Mayans to be portals to the underworld. For the first time ever, the BBC Natural History Unit explores this incredible, labyrinthine system of underground rivers.

Follow the struggle for survival of two female elephants trying to raise their young in one of the harshest climates on Earth.

Originally aired under BBC Natural World Collection. Many years ago lions thrived in the deserts of Namibia's Skeleton Coast, until they were exterminated by man. Six years ago maverick biologist Flip Stander discovered a tiny remnant population alive and well in nearby mountains, and started to study them. Their numbers have grown and they are now returning to the desert in increasing numbers. But if these lions are to continue roaming here, Flip will have to persuade local people that these lions are worth more alive than dead.

The Planet Earth team reveal their most memorable moments from the making of the series. We'll discover their high points, and their not so high points. And they'll tell us which sequences they consider to be their great Planet Earth moments. From the

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.

Plot of this episode is not specified yet. Please check back later for more update.