Although there is no consensus among biologists as to whether human behaviour can beexplained by evolution, there are a number of theories and models in different fields ofresearch that aim to do just that. Philosophy is no exception. In metaethics, evolutionarybiology is used to formulate an evolutionary debunking explanation. This skepticalepistemological tool is used to show that if evolution has, in some way, affected humanmorality, then we cannot have true justified belief in moral matters.An ongoing debate about the evolutionary debunking explanation is about howmuch empirical detail the evolutionary debunking explanation can demand. With this paper, Iwant to examine how philosophers writing about the evolutionary debunking explanation useevolutionary biology, as well as how much evolutionary biology is required for theevolutionary debunking explanation to be valid. I will argue that it is possible to identifythree difficulties in using evolutionary biology to formulate a philosophical tool.