Breeding Bird Survey annual reports
The Breeding Bird Survey started in 1994, and a report is produced every year containing population changes and other results from the scheme.
Since the WBBS started in 1998, this report has also included results from this survey.
BBS population trends
Bird population trends are published annually, and results from the most recent year are shown here:
Trends published in previous years can be found by downloading the relevant annual report from the BBS publications page.
Combined results from a number of BTO schemes, including joint CBC/BBS trends, can be found in the BirdTrends Report.
Due to COVID-19 restrictions limiting survey coverage in 2020, the survey covered a reduced suite of species for England only. Click here see these restricted results for 2020.
Maps of population density and trends
We produce maps showing both bird density estimates and population change for 49 common bird species, modelled using BBS data.
Country, region and county species summaries
We produce summaries of the annual numbers of species recorded, and number of BBS squares per species:
These lists are updated annually.
We summarise 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.
Leaving a legacy: how you can support BTO in your Will
BTO’s Sam Rider talks about her journey into legacy work with BTO, and about the power of leaving the organisation a gift in your Will.