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 w
ork is about repurposing everyday items.

BBC News went to meet him in his workshop.