Hibernation Survey
The NBMP Hibernation Survey is continuing again in winter 2024/25 in line with the latest IUCN Bat Specialist Group guidance on minimising the risk of transmission of any pathogens (currently known and unknown) between humans and bats, and vice versa. We have put together a document assessing the risks and adapting the guidance in the context of carrying out hibernation surveys in the UK (download here). This is a live document that is being updated to incorporate feedback and helpful tips from bat workers so please check the above link for updates (see updated date at top of document).
Click here for more information.
Many hibernation sites are surveyed regularly by individuals and bat groups throughout the UK. Through the NBMP we aim to collect and analyse counts on a UK-wide scale in order to produce annual species population trends. Local temperatures and the structure of the site can affect the number of bats using sites in winter. These factors need to be taken into consideration during any analysis so that conclusions can be made on bat population trends and not bat behaviour. We aim to identify changes in numbers of bats over and above ‘natural’ fluctuations, and highlight any signs of significant change.
Steps you need to take for the Hibernation Survey
Receive your survey pack in November
In order to take part in hibernation surveys you need to hold a bat licence that permits you to carry out hibernation surveys or know of a licensed surveyor who can accompany you. For further information about the relevant licence required, please contact your Statutory Nature Conservation Organisation (SNCO) headquarters or BCT (nbmp@bats.org.uk).
The pack includes survey forms and instructions to carry out this survey. The pack will be sent by email or by post depending on your preference. Please read these important health and safety documents below before you start your survey.
Risk assessment template
Download an example risk assessment form for use at hibernation sites.
Safeguarding policy
Carry out surveys from December-March
The standard survey method for the NBMP is to make one count in January and one count in February. We are now able to use counts from December to March in trend analysis so please do submit any counts you make, even if they are not within the January/February survey period. Try to ensure that there is at least one week between each count. If you cannot make a count between these dates, then you can choose the next closest date. Please mark it clearly on the count form. We are aware that at some sites counts are made outside the January/February period to ensure consistency with long-term monitoring at these sites.
Submit your counts
Once you have completed your surveys, submit your counts online or post your completed survey form to Freepost BAT CONSERVATION.
Your online recording pages enable you to view and download all data you have submitted. Read here how we share data via the NBN Atlas.
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