Moral foundations theory (MFT) proposes the existence of innate psychological systems, which would have been subjected to selective forces over the course of evolution. One approach for evaluating MFT, therefore, is to consider the proposed psychological foundations in relation to the reconstructed Environment of Evolutionary Adaptedness. This study draws upon ethnographic data on nomadic forager societies to evaluate MFT. Moral foundations theory receives support only regarding the Caring/harm and Fairness/cheating foundations but not regarding the proposed Loyalty/betrayal and Authority/subversion foundations. These (...) latter two proposed foundations would seem to reflect the historical classic assumptions of modernity, involving self-interest, competition, individualism, hierarchy, authority and so forth. Studying the ethical dimensions of nomadic forager societies can highlight our biases about the foundations of morality, some of which may be steeped in particularist Western political and social traditions. Some recent developments from cosmopolitanism are discussed as an alternative evolving worldview that parallels nomadic forager ethos. (shrink)