Peter Scott's guest is Heinz Sielmann, of Munich, who by the use of infra-red light has succeeded in filming a woodpecker's nest inside the trunk of a tree.
(A BBC telerecording of the broadcast on January 15)
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Peter Scott's guest is Heinz Sielmann, of Munich, who by the use of infra-red light has succeeded in filming a woodpecker's nest inside the trunk of a tree.
(A BBC telerecording of the broadcast on January 15)
