British Trust for Ornithology

'We harness the skills and passion of birdwatchers to advance our understanding of ornithology and produce impartial science - communicated clearly for the benefit of birds and people ... We are a non-campaigning organisation, and our aim is to conduct all of our work with the highest scientific rigour. This means we can produce robust evidence that can be used by anyone wishing to understand birds, other wildlife, their habitats and how different interventions may affect them.'