 The most radical version of this thought leads to the claim encountered towards the end of  section 1.4:  that talk of “human nature” involves no essential reference at all to the species Homo sapiens or to the hominin lineage. According to this view, the kind to which contemporary humans belong is a kind to which entities could also belong who have no genealogical relationship to humans. That kind is the kind of entities that act and believe in accordance with the reasons they take themselves to have. Aliens, synthetically created agents and angels are further candidates for membership in the kind, which would, unlike biological taxa, be spatiotemporally unrestricted. The traditional term for the kind, as employed by Aquinas and Kant, is “person” (cf. Hull 1986: 9).