Long one of France's most respected producers Jacques Perrin takes on his greatest challenge yet: exploring the mystery of birds in flight. Five crews of more than 450 people, including 17 pilots and 14 cinematographers, were necessary to follow a variety of bird migrations through forty countries and all seven continents. The film covers landscapes that range from the Eiffel Tower and Monument Valley to the remote reaches of the Arctic and the Amazon. All manner of man-made machines were employed, including planes, gliders, helicopters, and balloons, and numerous innovative techniques and ingeniously designed cameras were utilized to allow the filmmakers to fly alongside, above, below and in front of their subjects. The result is a film of staggering beauty that opens one's eyes to the ineffable wonders of the natural world.