For 80 million years, birds have ruled the skies, seas and earth. Each spring, they fly vast distances. Each fall, they fly back on the same route. This film is the result of four years following their amazing odysseys, species by species, flying over seas and continents. Long one of France's most respected producers (Academy Award® winners Z and Black and White in Color) and actors (Z, Cinema Paradiso), Jacques Perrin takes on his greatest challenge yet: exploring the mystery of birds in flight. Five crews of more than 450 people were necessary to follow a variety of bird migrations through 40 countries and all seven continents. The result is a film of staggering beauty that opens one's eyes to the ineffable wonders of the natural world.