Management action from citizen science was the topic of Finn Danielsens key note talk at the National Biodiversity Symposium in Denmark on 1-2 February 2017. The symposium was hosted by the Centre for Macroecology, Environment and Climate (CMEC) at University of Copenhagen. More than 340 scientists, managers, consultants and decision-makers from the private and public sector attended the symposium. Whereas scholars have often emphasized the number of people engaged in citiz