The term “anthropochorous” can be referred to the fauna which has populations or nuclei of individuals brought to and diffused in geographical areas by the direct or indirect action of humans. This definition therefore implicates the role of humans, either conscious or unconscious, in the alteration of the areas of distribution of the fauna. Hence, all the faunal populations that have originated as a consequence of human intervention fully belong to this category. As well as domestic animals in the strict sense, we can also cite several other “wild” species, such as rats and mice, which at present enjoy an artificial diffusion in areas that are completely extraneous to that of their original distribution.