 Prominent in contemporary thinking about evolutionary individuals is the work of Peter Godfrey-Smith on what he calls Darwinian individuals. On the view of evolution and natural selection he defends in Darwinian Populations and Natural Selection (2009), what evolves are “Darwinian populations”, collections of things in which at least three conditions hold: there is variation in the traits had by things in the collection, those traits are heritable within the collection, and some variants of the traits confer reproductive advantage on the things that bear them. In such a Darwinian population, the members are Darwinian individuals, which are both bearers and active reproducers of heritable traits (see Godfrey-Smith 2013: 19–20). 