Echo: An Elephant to Remember

Sir David Attenborough chooses his favourite recordings from the natural world that have revolutionised our understanding of song. Each one - from the song of the largest lemur to the song of the humpback whale to the song of the lyrebird - was recorded in his lifetime. When Sir David was born, the science of song had already been transformed by Charles Darwin’s theory of sexual selection: singing is dangerous as it reveals the singer’s location to predators, but it also offers the male a huge reward, the chance to attract a female and pass on genes to the next generation. Hence males sing and females don't.

Meet the big birds, a feathered family who have never flown a day in their lives! From ostriches to kiwis, these bizarre birds appear to be nature's greatest novelty act. How they came to be and how they continue to survive is a fascinating tale that has long captivated Sir David Attenborough. It is a story of dedicated dads, enormous eggs and a serious need for speed. And far from being the court jesters of the animal world, these flightless curiosities once nearly ruled the land.

Wildlife expert Valmik Thapar journeys through the Indian subcontinent, showcasing its diverse landscapes and rich flora and fauna, from deserts to snowy peaks, mangroves to coral reefs.

Consistently stunning documentaries transport viewers to far-flung locations ranging from the torrid African plains to the chilly splendours of icy Antarctica. The show's primary focus is on animals and ecosystems around the world. A comic book based on the show, meant to be used an as educational tool for kids, was briefly distributed to museums and schools at no cost in the mid-2000s.

Wild Sri Lanka is a three part mini series about this tropical island in the Indian Ocean, off the southeastern coast of India. This land was wracked by civil war for decades. But now, researchers can bring modern science and technology to bear, in order to take stock of what lives here. The series explores the diverse wildlife of the country's coast and seas, taking clues from the water around the island to examine how the landmass came to be and why its complex climate and unique location see such a diverse range of species inhabiting its shores.

Natural World is a nature documentary television series broadcast annually on BBC Two and regarded by the BBC as its flagship natural history brand. It is currently the longest-running series in its genre on British television, with more than 400 episodes broadcast since its inception in 1983. Natural World is produced by the BBC Natural History Unit in Bristol, but individual programmes can be in-house productions, collaborative productions with other broadcasters or films made and distributed by independent production companies and purchased by the BBC. Natural World programmes are often broadcast as PBS Nature episodes in the USA. Since 2008, most Natural World programmes have been shot and broadcast in high definition.

Tiger expert Valmik Thapar uncovers 50 years of archival footage, chronicling the legendary tiger clan of Ranthambore National Park and their remarkable revival in northwestern India.

In the jungles of north west India, there lives a remarkable wild tiger family. Now, using 50 years of footage, the story of their matriarchal clan is pieced together.

David Attenborough has a passion for birds' eggs. These remarkable structures nurture new life, protecting it from the outside world at the same time as allowing it to breathe. They are strong enough to withstand the full weight of an incubating parent and weak enough to allow a chick to break free. But how is an egg made? Why are they the shape they are? And perhaps most importantly, why lay an egg at all? Piece by piece, from creation to hatching, David reveals the wonder behind these miracles of nature.

Scottish cameraman and presenter Gordon Buchanan returns home to the Isle of Mull, after 15 years absence, to rediscover its wonderful wildlife and scenery. The Isle of Mull has the highest density of eagles in the United Kingdom, otters in every bay and even whales, sharks and dolphins in the surrounding seas. Gordon's specific mission is to find and film the Sea Eagle, the biggest bird of pray in Europe and one that has only recently returned to the Isle of Mull. Mull also has an exceptional population of Golden Eagles and truly deserves the name Eagle Island.

Helen Macdonald's bestseller H Is for Hawk told the story of a grieving daughter who found healing in training a goshawk. The goshawk is one of Mother Nature's own fighter jets, capable of finding and killing its prey with the speed of a lightning bolt. Now Macdonald digs deeper into the world of these raptors by following a family in the wild while raising and training a new goshawk of her own.

After 25 years of the Project Tiger Scheme operating in the Madhya Pradesh, these magnificent animals have become more trusting, permitting an extraordinary intimate film which follows them from sunrise to sunset, in monsoon rains and in shimmering heat

Gordon Buchanan heads to Ussuriland, Russia on his most testing trip to date, in search of the Russian tiger. It has the largest unbroken area of forest with the single largest population of tigers anywhere in the world. Anatoly Petrov will be his guide; he spends a lot of time in these forests and is one of the few people who have seen a wild tiger. This beautiful and remarkable film gives a unique insight into one of the most precious animals and forests left on earth.

Embark with conservation ecologist Chris Morgan on a great challenge: to find and film the Siberian tiger.

Rocks, dunes, sand and dust - large areas of Namibia in southwest Africa are characterized by deserts. Riverbeds full of sand meander through these inhospitable regions. Some of these only have water once every few years when enough rain has fallen in the mountains and the water rushes to the coast - but most of the time the river courses have dried up. And yet they are crucial for the survival of many living beings.