 How do theorists within the field of cultural evolution understand what ‘culture’ is (see Driscoll 2017 for general discussion)? Richerson and Boyd’s (2005) definition is fairly typical of the field as a whole, and is mirrored in definitions given by Mesoudi (2011) and Henrich (2015). Culture, they say, is ‘information capable of affecting individuals’ behavior that they acquire from other members of their species through teaching, imitation, and other forms of social learning’ (Richerson and Boyd 2005, 5). This raises the further question of what is meant by ‘social learning’. In an important overview of work on cultural evolution, Henrich gives a definition of this key notion for cultural evolutionary theory, and of the notion of ‘individual learning’ that it is regularly contrasted with: