Musician, broadcaster and birdwatcher Tom McKinney reads his series of five essays about bird migration and its fascination for bird lovers. Why do birds migrate? Why are some birds sedentary, moving only tiny distances throughout their entire life, and others willing to embark on such long journeys that involve enormously high levels of risk? In this series Tom considers the ways in which he has been affected by the sounds of birds and their astonishing annual migratory journeys.