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Earthflight - Barnacle Geese Flying Over London (Behind the Scenes)
Barnacle geese were hand-reared by the microlite pilot Christian Moullec and they now follow him as though he is their mother.
The clip shows the birds taking off from London city airport and flying over the Thames Barrier.
Earthflight uses many different filming techniques to create the experience of flying with birds across the continents of the world.
