Vigie-Nature is a citizen science program developed by the French National Museum of Natural History, bringing together several biodiversity monitorings. These monitorings propose to everyone, according to their knowledge, availability and interest, to collect standardized information on biodiversity. Initially targeting an audience of naturalists - with the objective of increasing the spatial and temporal coverage of data available for ecological research - Vigie-Nature has gradually opened up to other audiences : non-expert citizens, nature professionals and school students. Through a review of the societal and technological context, this article explores the evolution of Vigie-Nature during its thirty years of existence, and discusses the diversification and the necessary articulation of the objectives that have emerged from this evolution. Indeed environmental education issues were first identified with the introduction of new stakeholders into the management of the program when creating observatories for non-expert audiences. Then the deployment of Vigie-Nature École - a school-based version of the Vigie-Nature program - placed the pedagogical challenge at the heart of the animation and design of specific tools. Finally it appears that the diversification of objectives does not affect the original ambitions of the program as long as they are following a common aim : conservation of biodiversity.