Wetland Bird Survey Annual Report

Waterbirds in the UK

The Wetland Bird Survey (WeBS) is the principal scheme for monitoring the UK’s wintering waterbird populations, providing an important indicator of their status and the health of wetlands.

Survey results are reported in the annual publication Waterbirds in the UK, which comprises a summary report and updated species and sites numbers and trends and Low Tide maps via the WeBS Report Online interface. The report is published in the spring following the end of each WeBS year (which runs from July to June).

Summary Report

All WeBS annual summary reports are available for download. The current format, of dual publication of a summary report together with sites and species data online, began with Waterbirds in the UK 2011/12.

WeBS Report Online

Maximum counts for all sites, species indices and trends by country, low tide distribution maps, site totals for principal sites and minor sites and more are available on the WeBS Report Online interface.


For more detail on how the information is presented in the online report and important interpretation notes, please see the brief guide to WeBS Report Online and the comprehensive document

Indices and Trends Download

All indices and trends plotted in the species pages on the WeBS Report Online are also available as a spreadsheet download under an Open Government licence:

The indices spreadsheet contains one sheet per species (named with their two-letter codes - the top sheet gives the species name for each species code). For each species, the latest index and smoothed index values are shown for UK and constituent countries. Note that not all index values start at the same year, for reasons of data availability. The trends spreadsheet contains tables of 10 and 25 year trends for the UK and constituent countries. Please read the important methods and interpretation notes linked to above before using these datasets.


The latest WeBS data/annual report should be cited as:

Frost, T.M., Calbrade, N.A., Birtles, G.A., Hall, C., Robinson, A.E., Wotton, S.R., Balmer, D.E. and Austin, G.E. 2021. Waterbirds in the UK 2019/20: The Wetland Bird Survey. BTO/RSPB/JNCC. Thetford.


Datasets on the WeBS Report Online and the Indices and Trends spreadsheet are released under the Open Government Licence v3.0. To reuse, please include the following attribution statement:

“Contains Wetland Bird Survey (WeBS) data from Waterbirds in the UK 2019/20 © copyright and database right 2021. WeBS is a partnership jointly funded by the BTO, RSPB and JNCC, in association with WWT, with fieldwork conducted by volunteers."

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