A tale about the promise to return. Filming for three years in over 20 countries, a world class staff risked their lives to travel along with 100 different species of migratory birds across the world. Filled with breathtaking, never seen before footage.© Galatee Films - France 3 Cinema - Bac Films - Les Films da La Gueville - Pandora Films - Wanda Vision S.A. - Eyescreen S.R.L. - Les Productions JMH. Tous droits reserves. ©Galatee Films - Photographe:Mathieu Simonet.