When David Attenborough was filming in Madagascar for Zoo Quest in 1960, he was given pieces of an egg belonging to the largest bird to have ever lived – the extinct 'elephant bird'. The enormous egg has become one of his most treasured possessions. In Attenborough And The Giant Egg, David returns to Madagascar to see how the island has changed in the last 50 years and to search for more clues about the amazing elephant bird, which was something like a giant ostrich, weighing half a ton. He also investigates whether unravelling the story of its extinction can throw light on what is happening on the island today. There have been dramatic changes since David's first visit - 80 per cent of Madagascar's native forest has been destroyed; the human population has quadrupled; and many of its unique species are teetering on the brink of extinction. On the positive side, new species have been discovered and, today, scientists and conservationists know far more about the complexities of the environment.