NBMP Annual Report
The National Bat Monitoring Programme (NBMP) is an annual series of bat surveys undertaken by thousands of dedicated volunteers, which allow us to monitor changes in British bat populations. The data we collect are used by the Government and conservation organisations to monitor the health of our environment, inform policy and improve the conservation of bats.
This report provides updated population trends for nine of Great Britain's 17 breeding bat species, derived from data collected up to and including summer 2021. Usually, trends are updated annually for 11 species or species groups but in winter 2020/21 the Hibernation Survey had to be suspended due to COVID-19. Therefore, it has not been possible to produce updated Hibernation Survey trends for the reporting period covered by this report. We have republished the previous year’s Hibernation Survey trends (winter 2019/20) for reference, so that all the most recent species population trends can be found in one place.
Trends are provided at GB level and also at UK and country level where sufficient data are available. Updated trends are calculated for nine species in England, four species in Scotland, four species in Wales, one species in Northern Ireland and one species at UK level.
The next set of bat population trends, incorporating data collected up to and including summer 2022, are due to be published in May 2023.
Official Statistics: These statistics have been produced to the high professional standards set out in the Code of Practice for Official Statistics.
This report was compiled by Philip Briggs, Nathalie Cossa, Lia Gilmour, Sarah Scott and Parvathy Venugopal. Statistical analysis was completed by Steve Langton.
The report should be cited as: Bat Conservation Trust, 2022. The National Bat Monitoring Programme Annual Report 2021. Bat Conservation Trust, London. ____________________________________________________________________________________________
Annual Report data products
Two accompanying comma-delimited files are available: the indices and confidence intervals used to produce the species population trends; and a list of roost codes with species, max count ever recorded, county, region and country.
GB semi-natural habitat bat indicator
The comma-delimited file contains the indices and confidence intervals used to produce a bat indicator for semi-natural habitat across GB.
These data downloads are provided under an Open Government Licence (OGL), which allows free and flexible use and reuse of the data with few conditions. You must abide by these licence conditions. More information is available here.
The Open Government Licence requires users to acknowledge the dataset using the attribution statement provided. The attribution statement for this dataset is:
Contains National Bat Monitoring Programme (NBMP) data copyright and database right Bat Conservation Trust and the Joint Nature Conservation Committee, 2020
The National Bat Monitoring Programme is run by the Bat Conservation Trust, in partnership with the Joint Nature Conservation Committee, and supported and steered by Natural England, Natural Resources Wales, NatureScot and Northern Ireland Environment Agency. The NBMP is indebted to all volunteers who contribute data to the programme.
Bat Conservation Ireland contributes Northern Ireland bat records collated by the Irish Bat Monitoring Programme which is funded by the National Parks and Wildlife Service of the Department of Arts, Heritage and the Gaeltacht, Republic of Ireland and Northern Ireland Environment Agency. Data are shared on the NBN Atlas and GBIF.