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.
Due to COVID-19 restrictions limiting survey coverage in 2020, the resulted covered a reduced suite of species for England only. Click here see these restricted results for 2020.
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.
A tale of two warblers
Despite limited 2020 data due to COVID-19 restrictions, the latest BTO/RSPB/JNCC Breeding Bird Survey report highlights interesting trends.
BTO Data Reports
Our reports provide rigorous scientific information to inform Environmental Impact Assessments in the UK.