Male bitterns can be identified from their distinctive booming calls, helping ornithologists to count their numbers and conserve Britain's 'most important breeding bird'. Presented by Fergus Keeling and Nick Davies. Producer John Ruthven
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Male bitterns can be identified from their distinctive booming calls, helping ornithologists to count their numbers and conserve Britain's 'most important breeding bird'. Presented by Fergus Keeling and Nick Davies. Producer John Ruthven