How and why birds navigate the skies, travelling from continent to continent – flying thousands of miles across the earth each autumn and spring – has continually fascinated the human imagination, but only recently have we been able to fully understand these amazing journeys. How did this revolution come about? ‘Flight Paths’ is the never-before-told story of how an eccentric group of ornithologists, engineers and other pioneering scientists have harnessed nearly every technological development of the last hundred years to understand bird migration in detail – from where and when they take off, their flight paths and behaviours, their destinations and the challenges they face getting there.