Bailiwick Bat Survey 2022

The surveying season is now finished for 2022. We are currently analysing the data collected whilst our bats are hibernating.        The 2022 report will be available next year. 

The 2023 surveying season will begin again in spring. To receive updates or get involved in the survey, subscribe to our newsletter or send us an email – we’d love to hear from you! 


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 2021 bailiwick Bat survey 

2021 Bailiwick Bat Survey Report

During 2021, 720,011 recordings were collected across the Bailiwick of Guernsey which, following analyses and validation, included 710,260 bat recordings, and 8,211 small terrestrial mammal recordings. Over 1.5 million recordings contained bush-crickets and audible moth species which were recorded as ‘by-catch’, and we report species presence on a site and night basis. 

The full report includes a full species-by species breakdown of spatial, seasonal and through-the-night patterns of activity.

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