 Griffiths (2002) offered a testable psychological hypothesis to explain the recalcitrance of nativism in psychology and potentially other disciplines. The basic idea is that the concept of innateness is a cornerstone of “folk biology” (Medin and Atran 1999; 2004), the pre-theoretical beliefs that people intuitively use to understand biological systems. Part of folk biology involves the classification of organisms into species-like groupings. These classifications sometimes overlap with scientific classifications, but often they diverge. For example, a folk biological classification might identify horses, roses, and octopuses as species-like groupings, when in fact each of these biological categories contain numerous species, some of which are morphologically and phylogenetically disparate.