Date(s) - 16/07/2021 - 08/08/2021
It was launched in 2010 and has rapidly become the world’s biggest survey of butterflies. Over 111,500 citizen scientists took part in 2020, submitting 145,249 counts of butterflies and day-flying moths from across the UK.
In 2021 it will run from Friday 16 July to Sunday 8 August.
An app is available to help you identify and record butterflies. Find more information here.