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The inventor, which helps birds
November 25, 2015 Last updated at 00:03 GMT Clock
Nigel Butcher is sometimes called the "gadget man" RSPB.
He leads a small team to build the electronic device to help scientists, conservation charity, to collect data in the field.
Working with a budget of only £ 5,000 per year is Nigel to reorient a lot of work to everyday objects.
BBC News went to meet him in his studio.
Reporter Video: Nick Cunard
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