Might human morality be a product of evolution? An increasing number of philosophers and scientists believe that moral judgment and behaviour emerged because it enhanced the fitness of our distant ancestors. This volume collects some recent explorations of the evidence for this claim, as well as papers examining its implications. Is an evolved morality a genuine morality? Does an evolutionary origin deflate the pretensions of morality, or strip it of its force in guiding behaviour? Is an evolutionary approach compatible with realism about morality? All sides of these debates are represented in this volume.