The survey has recorded the huge declines in some of our most familiar birds. Since 1979, the number of house sparrows counted has fallen by 52% and the number of starlings by 76%.
However, it isn't all bad news - chaffinchs and great tits have both seen their numbers increase since 1979 by 36 and 52 per cent respectively.
Our scientists can then use these patterns in bird numbers to help prioritise our bird conservation work.
Why not spend an hour this weekend watching the birds, and help contribute to this vital research?
Cartoon from the talented and curiously attractive chaps at Climate Cartoons. Click on the panel to read the full strip.