“…In particular, work with ten primate species spread across the great apes, Old World monkeys, and New World monkeys demonstrates that inequity is most common in species that show high levels of cooperation with non-kin, non-pair social group members (Brosnan 2011). That is, primates that routinely form coalitions and alliances for support, rank acquisition or territory defense, cooperatively hunt, or otherwise socially cooperate, including chimpanzees (Brosnan, Schiff et al 2005;Brosnan, Talbot et al 2010), capuchin monkeys (Brosnan and de Waal 2003;van Wolkenten, Brosnan et al 2007;Fletcher 2008;Takimoto, Kuroshima et al 2009), macaques (McCleam andHarlow 1954;Beran, Rumbaugh et al 2007), and, possibly, bonobos (Bräuer, Call et al 2009), respond to inequity while other, often closely related (Talbot, Freeman et al 2011) and equally largebrained species (Meyer, Polidora et al 1961;Bräuer, Call et al 2009) do not. Moreover, these results do not map on to other distributions, such as those based on brain size, performance on cognitive tasks, or extent of sociality (Brosnan 2011).…”