These data are collected in the extension area of the Great Green Wall in Ferlo (North, Senegal) between 2016 and 2021. They concern the biodiversity of large wild mammals present in Koyli Alpha. This work was carried out within the framework of the Observatoire Hommes-Milieux international Téssékéré and (co)funded by the LabEx DRIIHM, French programme "Investissements d'Avenir" (ANR11-LABX-0010) which is managed by the ANR.