Invasive species are now looked upon as the second biggest cause of the degeneration of world biodiversity. Adopting the methodological principle of linking sociology with history, our objective here is to scrutinize the conditions of production of the separation of “native” from “foreign-born” species. These views are strongly reminiscent of what is usually said about human migrations. As the views and practice towards human foreigners are sometimes disturbingly applied to wild fauna and flora, we will carry out an analysis of the verbal analogies between these two areas of discourse.