'This is, quite simply, the best thing I've ever done.' Sir David Attenborough on the TV series, The Trials of Life, upon which this book is based. This is the third and last of Sir David's great natural history books based on his TV series and competes his survey of the animal world that began with Life on Earth and continues with Living Planet. In Life on Earth, Sir David showed how each group of animals evolved. In Living Planet he looked at the way they have adapted to the whole range of habitats in which they live. Now, in Trials of Life, he completes the story by revealing how animals behave - and why.