Latest results

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. View the restricted results for 2020

Maps of population density and trends

We produce maps showing both bird density estimates and population change for 49 common UK 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.

Mammal monitoring

We summarise the latest mammal population trends produced using BBS data, and counts of mammals recorded on BBS squares in the most recent year.

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