“…Introduction This paper considers the question of whether chimpanzees possess at least a primitive sense of normativity, by which I mean some ability to internalize and enforce social norms -rules governing appropriate and inappropriate behaviour-within their social groups, and to make evaluations of others' behaviour in light of such norms. A number of scientists and philosophers have argued that a sense of normativity does exist in chimpanzees and in several other non-human primate and mammalian species (e.g., Bekoff and Pierce, 2009;Andrews, 2009Andrews, , 2013Andrews, , 2020Musschenga, 2013;de Waal, 2014;Burkart et al, 2018;Vincent et al, 2019;Monsó and Andrews, forthcoming). However, there remains in many circles considerable scepticism about the idea of there being any kind of normative reasoning in non-human animals, even our closest living relatives, the dominant view being that psychological capacities for social norms, normative evaluation and motivation evolved uniquely in the human lineage, after our last common ancestor with chimpanzees and bonobos (e.g., Kitcher, 2011;Henrich, 2015;Tomasello, 2016;Schmidt and Rakoczy, 2019).…”