Budding 'bat detectives' are being invited to track Guernsey's bat population this Halloween.
Islanders will be able to borrow ‘bat detector’ surveying equipment from Guernsey's Guille-Allès library.
The library is working alongside the Biodiversity Partnership to encourage a local interest in bats and raise awareness of the threats development and loss of prey pose to the island's bat population.
Julia Henney, the island's Biodiversity Education Officer, says this is a great opportunity for people to learn more about the species on the island.
The detectors use technology that picks up the ultrasound calls made by the bats and convert them into sounds that humans can hear.
Information sheets are available from the library with a list of the island's most common bat species and the nature and frequency of their calls.
The information gathered from this project could help monitor the animals' behaviour and habitat.