Return Of The First Cuckoo

This programme celebrates the nature diaries kept by Radio 4 listeners which came to light after the broadcast of The First Cuckoo and the Last Swallow in August 2005.
The information is being used to help Tim Sparks, an environmental scientist at the Centre for Ecology and Hydrology, put together a picture about Britain's changing climate.
Sparks says nature is so complex that we need to know how plants and animals have reacted to temperature in the past to give us some idea about what will happen in the future.