This book explores citizen science from the perspective of its pedagogical potential. It demonstrates its pivotal role in enhancing educational outcomes and advancing scientific inquiry, specifically in the realms of biology and environmental education. Overall, the chapters confirm that citizen science initiatives can effectively engage learners, facilitate different types of reasoning, foster a deeper understanding of the nature of science and scientific concepts, and promote environmental citizenship. The empirical evidence underscores the transformative potential of involving learners in authentic scientific endeavors.