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National Bat Monitoring Programme Annual Report 2017

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 population trends for 11 of Great Britain's 17 resident bat species derived from data collected up to and including summer 2017. Trends are provided at GB-level and also at country-level where sufficient data are available (for 11 species in England, four species in Scotland, eight species in Wales, and one species in Northern Ireland). This report also provides information on our survey methods.

The next set of bat population trends, incorporating data collected up to and including summer 2018, are due to be published in May 2019.

Click here to download the 2017 report

Species with increasing populations:

Greater horseshoe bat (Gareth Jones) Lesser horseshoe bat (Gareth Jones) Common pipistrelle (Hugh Clark)
Greater horseshoe bat Lesser horseshoe bat Common pipistrelle

Species with stable populations:

Daubenton's bat (Hugh Clark) Noctule (Hugh Clark) Soprano pipistrelle (Daniel Hargreaves) Brown long-eared bat (Hugh Clark)
    Daubenton's bat          Noctule   Soprano pipistrelle  Brown long-eared bat

Results to be treated with caution at present:

Natterer's bat (Hugh Clark) Whiskered bat (Hugh Clark)   Serotine (Robert Stebbings)
      Natterer's bat  Whiskered/Brandt's bat            Serotine


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, Charlotte Hawkins, Thomas Sheppard and Becky Wilson. Statistical analysis was completed by Steve Langton.

The report should be cited as: Bat Conservation Trust, 2018. The National Bat Monitoring Programme. Annual Report 2017. Bat Conservation Trust, London. Available at

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 EnglandNatural Resources WalesNorthern Ireland Environment Agency, and Scottish Natural Heritage. 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.

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