The film follows the spring migration of numerous Northern Hemisphere species on their journey north to the Arctic Circle. Geese, cranes, swans, terns, anything that takes wing and heads north is accompanied by the filmmakers. It's such an extraordinary feeling flying alongside the birds with the earth and its distinctive features, monuments and cities clearly defined below that you get the eerie feeling that this is just another computer-generated trick. But any special effects are denied in the opening credits of the film. Each species of bird is introduced by a sub-title telling us how far it flies in its migratory pattern, where it originates and where it's heading. Like the Arctic Tern which flies 12,500 miles twice a year from the Artic to the Antarctic and back and the less adventurous Red-crowned crane whose voyage lasts only 600 miles. After four years of production, three years filming with 14 cinematographers, 17 pilots, including those on ultra-light aircraft and hot-air balloons, and with land-based robots covering 40 countries, writer/director, narrator Jacques Perrin and his crew have created an intimate and yet epic journey with numerous comic, aggressive and stoic performers. Perrin's narration is sparse, this is no David Attenborough insight into the behaviour of fauna, it's a visual feast of feathers and locations, from the Arctic to the deserts of Africa, from Mont St. Michel to Monument Valley. This bird's eye view is a mesmerising and totally fascinating experience.Comments by David StrattonMarvellous photography enhances this stirring nature film about the tenacity of birds of all sorts as they take off on long voyages of migration. Some rather contrived scenes as the birds fly past famous city landscapes, but overall a magnificent achievement.