 Hence, most teleonaturalists favor accounts of biological function which make the explanatory role of this notion a desideratum. Naturalistic accounts typically aim to satisfy two additional desiderata. They should distinguish genuine biological functions from accidental utility (such as noses supporting glasses), and they should capture the normative dimension of function in order to preserve a function-malfunction distinction. Although these three desiderata are neither universally accepted nor are they adequacy conditions in the strict sense, they have nevertheless achieved canonical status within the contemporary debate over biological functions. 