David Attenborough travels to the Jura Mountains in the Swiss Alps, to find out about one of the largest animal societies in the world, where over a billion ants live in peace.
A journey to the source of the Ganges in the Himalayas unearths deep gorges, lush forests and flower-filled valleys, and brings encounters with wildlife, elusive snow leopards and black bears, to bone-crunching vultures and the monkeys that may lie behind the legend of the yeti. Plus a look at the journeys made by Hindu pilgrims to worship at the four sacred sources of the river.
The human eye is an amazing mechanism, able to detect anywhere from a few photons to a few quadrillion, or switch focus from the screen in front of you to the distant horizon in a third of a second. How did these complex structures evolve? Joshua Harvey details the 500 million year story of the human eye.
Life in the sea rebounded with a vengeance in the Devonian. Dozens of monstrous predators emerged, like the 40-foot long Dunkleosteus. Nearly everything was wiped out in Earth’s second mass extinction. But the stage was set for an explosion of life on land.
The giant panda gives birth to the smallest baby of any mammal and has to care for and protect it for many months. Why don't they give birth to more developed, robust young? The kiwi lays one of the largest eggs in the bird world, which produces a very well-developed chick. Why do kiwis produce a single egg that is a quarter of its body mass and almost too big to lay?