Microlight pilot Christian Moullec went to extraordinary lengths in order to film birds in flight from up close. He hand-reared a brood of Barnacle Geese who now see him as their mother and follow him in flight.

The new BBC One series Earthflight has filmed birds across the continents of the world using a variety of innovative techniques. Watch at 20:00GMT on Thursdays from 29 December or online afterwards via iPlayer at the above link (UK only).