Nature Environnement 17 is responsible for the management of three natural sites, whose recognised heritage issues are the subject of a 10-year management plan for the RNR of La Massonne. The management of these sites is reflected in annual action programmes which set out all the operations to be carried out: maintenance and restoration of natural environments, monitoring and studies of habitats and species, site monitoring, hosting of a wide audience and training.The study and monitoring of the colony of the 2 bat species of the former Annepont mill use technological innovation and federate scientific partners to provide new knowledge about the behaviour of these species.