Rare footage that solved the secret of how a cuckoo lays its eggs in other birds' nests is being shown on television almost 90 years after it was recorded.
It was filmed by Oliver Pike with a hand-cranked camera in the 1920s and is one of the first wildlife films ever made.
The footage, courtesy of the British Film Institute national archives, features in Cuckoo, a new film for the wildlife series Natural World.
Cuckoo is on BBC Two on Friday 9 January at 2000 GMT.
One-Minute World News
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