The BioBlitzes are one of the most popular activities in the field of environmental Citizen Science. They consist of 24h sampling as many species as possible in a determined study area. All the BioBlitzes organized by the Maremma Natural History Museum are always held on territorial realities belonging to the Natura 2000 network. They are free events open to everyone and characterized by having a Base Camp. Participants register (online or during the event) for the proposed activities (about 30) and collaborate with experts to list as many living species as possible in the area. The material necessary for the surveys is provided by the Maremma Natural History Museum, together with information leaflets on Citizen Science, inside a cotton bag with the logo of the event, delivered at the time of registration. During the field surveys, experts and citizens through the iNaturalist app take pictures of the present species and record GPS coordinates. At the Base Camp, the core of the whole event, they can identify the species (if they need) thanks to the material made available by the Museum (guides with dichotomous keys, binocular microscopes, computers connected to the internet ...) and insert the data collected in the iNaturalist project. Data entered are validated by the experts, integrated with information on the main environmental protection legislation, and subsequently used for didactic reports and scientific articles regarding the biodiversity of the investigated areas. Furthermore, all the data collected increase the database of the Maremma Natural History Museum on the biodiversity of southern Tuscany. The observations are also shared with the Re. Na. To. platform (Tuscany Region Naturalistic repertoire) and with the National Network for Biodiversity, promoted by the Ministry of the Environment and managed by ISPRA (Higher Institute for Environmental Protection and Research).