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Available for over a year

Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs. David Attenborough presents the story of the Bewick's Swan. This year is the 50th anniversary of Bewick Swan studies, begun by Sir Peter Scott, at Slimbridge in Gloucestershire. Bewick Swans return here and to other UK sites each winter to escape the icy grip of the Arctic tundra and studies have identified individuals through their varying bill patterns.