This research aims to investigate the distribution factors of Erythrocebus patas (red monkey) in the classified Agoua forest. The data was collected from the floristic inventory, carried out within 30 30m x 30m squares. Similarly, direct observations were made to note the variables that favour the presence of the species. An Analysis of The Main Components (CPA) is done on the data collected to establish the correlation between the different types of plant formation and the characteristic elements of the environment. The results show that 70% of the red monkey's habitats are found in savannas on ferralitic and ferreginous soils and 30% of its habitats are in forest galleries, on hydromorphic soils. These habitats are generally characterized by the presence of plant species that provide them with food, serve as resting places, hiding places and predation. Water points, roads and fields are less than 5km from these habitats. However, local populations have a variety of knowledge about the use of red monkeys. All this information allows the development of an ethnobotanical repository for the conservation of the species in central Benin.