BBS annual reports
The BBS started in 1994, and a report is produced every year containing population changes and other results from the scheme. Annual reports for every year back to 1994 can be viewed and downloaded.
BBS population trends
Bird population trends are published annually, and results from the most recent year are shown here.
Combined results from a number of BTO schemes, including joint CBC/BBS trends, can be found in the BirdTrends Report. Trends published in previous years can be found by downloading the relevant annual report from the BBS publications page.
Maps of population density and trends
Maps showing both bird density estimates and population change for 49 common bird species, modelled using BBS data.
Country, region and county species summaries
Annual numbers of species recorded, and number of BBS squares per species, by country (England, Scotland, Wales and Northern Ireland), by English Region, and by county. These lists are updated annually.
The latest mammal population trends produced using BBS data, and counts of mammals recorded on BBS squares in the most recent year.
Youth Advisory Panel
Meet our panel of volunteers who help steer BTO to better serve our younger supporters.