A number of ecologists and animalist activists reclaim the condition of person to superior animals. Besides the historical trajectory of this term and as a consequence of the atrocities inflicted to millions of innocent humans during the big Wars of the Twentieth century, different currents of Personalism reserved the word person to stress the very high dignity of each human being. This special condition is due to the constitutive rationality of our species. The essential ration-ality is what allows us to be radically self-conscious and morally free, to the point of being able to self-determine our own end. In this way, the concept person means the uniqueness of each human being. But, what happens with superior an-imals?