The Wider Countryside Butterfly Survey (WCBS) is the main scheme for monitoring population changes of the UK’s common and widespread butterflies. It is important in both assessing the changing status of widespread butterfly species and in providing an indicator of the health of the wider countryside. Data from this scheme feeds into the UK Butterfly Monitoring Scheme (UKBMS).
Click here for more information.: Wider Countryside Butterfly Survey | BTO – British Trust for Ornithology