Evolutionary anthropology charts the biological emergence of human species and its relation to non-human primates and other species. It also examines how human bodies have adapted to different environments and the ways in which social and biological factors intersect in the prevalence of diseases and in rates of reproduction and death. Evolutionary anthropology emphasizes quantitative methods, whether in statistical analyses of morbidity patterns, the discovery and measurement of ancient bones and artefacts, or the observation of non-human primate mating behaviours.