The inventor who helps the birds

Nigel Butcher is sometimes referred to as the RSPB's "gadget man".

He heads a very small team that build electronic devices to help scientists from the conservation charity gather data in the field.

Working with a budget of just £5,000 a year, a lot of Nigel's work is about repurposing everyday items.

BBC News went to meet him in his workshop.

Video journalist: Nick Cunard

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