Bailiwick Bat Survey 2024

The surveying season is finally here! 


The booking system is now available for volunteers to reserve their squares and detectors. Click on the map to book in! 


If you’re new to the project and would like to take part, please follow the steps here to get started.


If you have any queries, please get in touch and we’ll get back to you as soon as possible.

The survey aims to improve our understanding of the distribution and activity of the different species of bat found in Guernsey, Herm, Alderney and Sark whilst providing an opportunity for anyone across the islands to take part in this project.

Why care about Bats?

Bats are an ‘indicator species’. They can tell us a lot about the state of our environment as they are a top predator for nocturnal insects. Bats will be affected by changes in landscape, agriculture practises, development and habitat fragmentation. These changes will have an impact on many species in Guernsey but by surveying the changes in bat populations, it will indicate the wider health of our wildlife, without having to count every species.

Bats are a natural form of pest control, eating thousands of insects each night – including mosquitos! They are great for keeping bugs away from crops which provides a valuable service for agriculture and even your own vegetable patch. Bats provide this service free of charge, and without the use of pesticides.

Sadly, bat species around the world are vulnerable or endangered due to factors ranging from loss of habitat, diminished food supply, destruction of roosts, disease or killing of bats. 


However … there are lots of things we can do to help!
To learn more, head to our ‘Bat Protection’ page. 


Read the results of the 2023 bailiwick Bat survey 

2023 Bailiwick Bat Survey Report

During 2023, 582 different locations across the Bailiwick of Guernsey were surveyed. Recording was undertaken on 228 different nights mainly between April and the end of October, amounting to a total of 2,260 nights of recording effort across sites.
Overall, 3,825,977 five second triggered recordings were collected which, following analyses and validation, were found to include 994,021 bat identifications, and 7,973 small terrestrial mammal identifications. There were also over 2 million identifications of bush-crickets as ‘by-catch’, for which we report species presence on a site and night basis.

Subscribe To Our Newsletter

Keep up to date with news, updates and events from the Bailiwick Bat Survey