This year's State of the UK's Birds report highlights how climate change is affecting our wintering and breeding birds. This annual 'stock take' of bird numbers is a collaboration between the RSPB, the British Trust for Ornithology and the Wildfowl and Wetlands Trust with the UK's statutory conservation bodies. On this month's Nature's Voice Jane Markham finds out more from RSPB conservation scientist Dr Daniel Hayhow and Dr Teresa Frost from the BTO.