This review considers Frans de Waal's The Bonobo and the Atheist: In Search for Humanism Among the Primates (2013) from a behavior-analytic perspective. In his book, de Waal asserts evolution as the predominant level of selection for moral behavior, denies the possibility of a prescriptive science of morality, and misrepresents the science of behavior analysis. We expand upon de Waal's analysis and incorporate operant and cultural levels of selection of moral behavior. We also address the distinction between facts and values and describe behavior-analytic interpretations of belief. In addition, we briefly discuss the possibility of developing a behavior-analytic science of moral behavior.Keywords Altruism . Behaviorism . Morality . Pragmatism . ValuesIn The Bonobo and the Atheist: In Search of Humanism Among the Primates (de Waal 2013), primatologist Frans de Waal attempts to usurp religion as the prevailing source of moral behavior, and replace it with our evolutionary history as social animals. To support his thesis, de Waal offers evidence from our primate relative, the bonobo, who regularly demonstrates moral behavior in the absence of religion. Throughout the book, de Waal emphasizes our continuity with other species, insisting that we should approach morality from the Bbottom up^as a product of evolutionary history rather than something imposed by divine sources. In doing so, he suggests that, B[w]e started out with moral sentiments and intuitions…Rather than having developed morality from scratch through rational reflection, we received a huge push in the rear from our background as social animals^(p. 17). De Waal frequently relies on these Bsentiments and intuitions^as the anchors by which all moral principles are grounded, eventually concluding that B[m]oral law is not imposed from above or derived from well-reasoned BEHAV ANALYST (2015) 38:293-307