The study of migratory movements allows us to understand the logic of development in Côte d'Ivoire, and indeed in West Africa. Until recently, this country was a host country for a large number of African nationals, with a view to acquiring a higher level of income than in their countries of origin. The use of foreign labour to develop agricultural land has been one of the keys to the Ivorian miracle. This migration policy promoted by the Ivorian authorities has encouraged the massive arrival of African nationals, boosting the country's economic growth. However, this migration policy has had negative consequences on the forest. The importance of the anthropic factor in the degradation of forest areas must be taken into account. The anthropic actions of the populations on the classified forest of Haut-Sassandra induce the degradation of the latter by the presence of numerous camps and vast agricultural plantations. In this article, we will examine the main causes affecting the classified forest of Haut Sassandra. We will discuss the serious danger that the loss of biodiversity represents for the ecological balance of the natural rural environment and the well-being of mankind by taking into account biodiversity in the conduct of human activities. Using a qualitative and quantitative approach, we mobilised documentary research, direct observation, individual interviews and questionnaire administration. The results obtained indicate that the anthropic activity of migrants negatively affects the classified forest of Haut Sassandra. Ultimately, anthropic activities have led to the development and aggravation of deforestation in this area.