Anthropologists of the ontological turn claim that certain entities, processes, and relations are in principle inaccessible to outsiders of specific communities. Philosophers of ethnobiology see a challenge to the integration of scientific and ethnoscientific knowledge of nature in this claim. They propose to negotiate integration within a framework of overlapping ontologies. I explicate the methodology of the ontological turn and claim that it offers a better understanding of knowledge integration than does the philosophers’ framework. Based on two case studies, I (...) argue for a revised notion of knowledge integration that takes scientific change and mutual influence between communities into account. (shrink)