The correspondence in BB recently about whether the deterioration in hearing ability with age affects the results of bird survey work (see: http://www.britishbirds.co.uk/letters/hearing-tests-for-bird-survey-workers-2 and http://www.britishbirds.co.uk/letters/more-on-the-hearing-abilities-of-ageing-bird-surveyors has attracted the attention of the BBC's science magazine on Radio 4, Material World....

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