This dataset contains records from the Sunset/Sunrise Survey run by the Bat Conservation Trust as part of the National Bat Monitoring Programme. Volunteer surveyors spend the hour after sunset and/or the hour before sunrise in their garden or local open space looking for bats and other nocturnal animals. A visual guide is provided to help surveyors identify several of the more common bat species. Not all records are verified but volunteers are asked to indicate what method they used to identify the species from a dropdown list of bat species ID methods, and this will give some indication of the likely accuracy of the identification. For more information please visit https://www.bats.org.uk/our-work/national-bat-monitoring-programme/surveys/sunset-sunrise-survey