Secret History documentary charting an astounding archaeological investigation in South Africa that has discovered the remains of an entirely new species of human ancestor: Homo naledi. Following an expedition by a team of experts, led by Professor Lee Berger, as they recover over 1,500 fossilised bone fragments from a deep and nearly inaccessible cave and conduct extensive analysis
This episode continues the study of mammals, and particularly those whose young gestate inside their bodies. Attenborough asks why these have become so varied and tries to discover the common theme that links them. Examples of primitive mammals that are still alive today include the treeshrew, the desman and the star-nosed mole. Insect eaters vary enormously from the aardvark, giant anteater and pangolin to those to which much of this programme is devoted: the bats, of which there are nearly 1,000 different species. These took to flying at night, and its possible that they evolved from treeshrews that jumped from tree to tree, in much the same way as a flying squirrel.
Located on the Malilangwe Game Reserve in southern Zimbabwe, this 800-year-old baobab is a remarkable tree containing its own ecosystem. Capable of withstanding extreme drought by storing water in its hollow trunk, it draws a multitude of wildlife, from elephants who strip its bark in search of food, to vultures that nest on its branches. Remarkably, it also has another gift: a velvety fruit packed with an astonishing cocktail of nutrients. To witness the baobab is to be awed by the natural forces that produced it.
For the animals of the Okavango Delta, life itself depends on a fortuitous natural anomaly: a river that cuts through the mighty Kalahari Desert. Embark on a tour of this accidental paradise, where a colorful ecosystem of plants, animals, and birds flourish in the unexpected abundance.