Reports

Reports

BTO publishes various reports, from those covering the annual results of core surveys, through scientific studies, and on to those produced in partnership with other organisations. Many of these are published as BTO Research Reports, which includes BBS reports, Waterbirds in the UK (WeBS) reports and SMP reports. You can access all of our reports from here, though note that we are currently updating the reports section, working backwards through time to bring all of the report pages into a consistent format. You can read our Annual Report and Accounts in the Governance section.

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Waterbirds in the UK 2024/25

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Published: Winter 2026

Waterbirds in the UK provides a single, comprehensive source of information on the current status and distribution of waterbirds in the UK for those interested in the conservation of the populations of these species and the wetland sites they use. Key stories from the 2024/25 report include an overview of our wintering gull populations, as well as the latest papers and results from the Wetland Bird Survey and Goose and Swan Monitoring Programme. The report, published on 16 April 2026, is this year’s annual report and official statistic for the BTO/RSPB/JNCC Wetland Bird Survey (WeBS) and the BTO/JNCC/NatureScot Goose and Swan Monitoring Programme (GSMP). It presents and analyses data about the UK’s wintering waterbird species, collected by 4,000 dedicated volunteers across the UK. Both WeBS and GSMP have robust, long-term datasets that map the changing population size and distribution of the UK’s internationally important wintering waterbirds like ducks, geese, swans and waders. As our waders and wildfowl continue to adapt to a changing climate and other threats like disease, Waterbirds in the UK provides essential data about their movements and distribution. WeBS and GSMP are both vital components of the international collaborative effort to monitor these species on a flyway scale and inform future conservation decisions. Read and download the reportView comprehensive results in the WeBS Report Online More information on the results and methods

16.04.26

Reports Waterbirds in the UK

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The Breeding Bird Survey 2025

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Published: Spring 2026

This is the 31st annual report of the BTO/JNCC/RSPB Breeding Bird Survey (BBS) and Waterways Breeding Bird Survey (WBBS), documenting the population abundance trends of widespread UK breeding bird species during the periods 1994–2025 and 1998–2025 respectively. These are the main schemes for monitoring the population changes of the UK’s widespread breeding birds, providing an important indicator of the health of the countryside. The results are published annually as Official Statistics and used widely by Defra and the Statutory Nature Conservation Bodies (SNCBs, e.g. Natural England and NatureScot) to set priorities and to inform conservation action, and as the evidence base against which the UK’s biodiversity targets are measured. BBS data are also routinely used in research, with recent examples including peer-reviewed papers published in 2022 and 2024, which measured the efficacy of the UK’s network of protected areas in supporting wildlife. In this report The 2025 Breeding Bird Survey Report highlights the varying fortunes of four of the UK’s widely monitored wild doves and pigeons. Whilst Stock Dove and Woodpigeon are faring well – Stock Dove has increased by over 40% in the last 10 years – the Turtle Dove decline shows no sign of abating, and Collared Dove has declined by around 40% since 2005. In Scotland, species of woodland and scrub – including Willow Warbler, Tree Pipit and Bullfinch – continue to increase, whilst populations further south in Britain are declining. In Wales, there are mixed fortunes. Woodland species such as Great Spotted Woodpecker have increased over threefold, and Nuthatch has increased by 55%, since 1995. Meanwhile, Curlew and Yellowhammer continue to decline. In Northern Ireland, which sees a change of baseline for monitoring trends from 1994 to 1996, the pattern of increasing Song Thrush (+75%, 1997–2024) and declining Mistle Thrush (-35%) highlights a UK-wide pattern for these two closely related species. Several species are not monitored by BBS in Northern Ireland, particularly farmland birds such as Kestrel, Curlew and Yellowhammer, and additional efforts are underway to improve monitoring in these declining species. The 2025 season was also noteworthy for seeing a record number of 1-km squares being visited, with over 2,800 surveyors visiting 4,058 sites. We thank these skilled and dedicated volunteers who give their time to BBS and WBBS and make the monitoring of the UK’s breeding birds possible. Read and download the 2025 reportOr, browse all editions of the Breeding Bird Survey Report

09.04.26

Reports BBS Report

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Trialling farmer wader counts and bioacoustics to aid agri-environment scheme evaluation

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Published: 2026

The primary tool by which wader conservation is delivered in farmed landscapes is agri-environment schemes, whereby payments incentivise land managers to conduct beneficial management for species or habitats. Assessments of the effectiveness of such schemes have been based on infrequent, large-scale surveys which do not produce landscape- or intervention-specific evidence to facilitate local adaptations to the design of agri-environment schemes. This report details work carried out at 10 participating farms in the Yorkshire Dales National Park, where we trialled two methods that could help to evaluate the effectiveness of scheme measures at regional scales.

27.03.26

BTO Research Reports

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Northern Ireland Seabird Report 2025

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Published: 2026

This report is the published outcome of the work of the Northern Ireland Seabird Network — a network of volunteers, researchers and organisations — coordinated by the BTO Seabird Coordinator, and funded by NIEA. It contains detailed species accounts for the 22 breeding seabird species in Northern Ireland, as well as articles on a range of topics: Manx Shearwaters nesting on Rathlin Rathlin Island Breeding Seabird Census 2025 Tracking Lesser Black-backed Gulls on Lough Neagh Puffins return to Isle of Muck Outer Ards: 2025 Seabird Nesting Report Strangford Lough: 2025 Seabird Nesting Report Forthcoming seabird research work: ACCLIMATISE project

26.03.26

Reports Northern Ireland Seabird Report

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Connecting Constable and Gainsborough Country: baselining for landscape recovery using multi-taxa passive acoustic monitoring

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Published: 2026

Connecting Constable and Gainsborough Country is a DEFRA-funded Landscape Recovery project. This report describes the use of passive acoustic monitoring to assess the status and distribution of birds, bats, terrestrial small mammals, and bush-crickets across the Stour, Brett, and Box valleys in south Suffolk. The project supports habitat restoration and woodland connectivity, with a focus on rare or declining species of conservation concern, including the Hazel Dormouse, informed by robust monitoring.

25.03.26

BTO Research Reports

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Seabird Population Trends and Causes of Change: 1986–2024

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Published: 2026

The annual report of the Seabird Monitoring Programme View and download the report Read the report online This report presents the latest seabird population trends in breeding abundance and productivity using data from the Seabird Monitoring Programme (SMP). It documents changes in the abundance and productivity of breeding seabird species in Britain and Ireland from 1986 to 2024. This report includes both inland and coastal populations and trends from the Channel Islands, England, Isle of Man, Northern Ireland, Scotland, Wales and the Republic of Ireland, which are presented where sufficient data are available. The results from this report are used more broadly to assess the health of the wider environment, to inform policy and for conservation action.

19.03.26

Reports SMP Report

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