Witness as five film crews follow a rich variety of bird migrations through 40 countries and each of seven continents. With teams totalling more than 450 people, 17 pilots and 14 cinematographers used planes, gliders, helicopters and balloons to fly alongside, above, below and in front of their subjects. The result is a film of staggering beauty that Entertainment Weekly hailed as "mesmerizing!" and the Los Angeles Times applauded as "Breathtaking! As lofty as it is exhilerating."