When entire school classes participate in a citizen science project, teachers and youth group leaders take on the role of facilitators. What describes this group of facilitators who demonstrate the process of scientific knowledge production using citizen science? Quantitative surveys can be a valuable methodological approach to identify the characteristics of participants in citizen science projects. The report offers insights into the research accompanying the international citizen science campaign “Plastic Pirates - Go Europe!” by presenting and discussing results of questionnaires to teachers and youth group leaders as facilitators of participation.