Inferring the relative rank (ie, status) of others is essential to navigating social hierarchies. A
survey of the expanding social psychological and neuroscience literatures on status reveals …

Percussive tool use holds special interest for scientists concerned with human origins. We
summarize the findings from two field sites, Taï and Fazenda Boa Vista, where percussive …

This comprehensive introductory text integrates evolutionary, ecological, and demographic
perspectives with new results from field studies and contemporary noninvasive molecular …

All investigated cases of habitual tool use in wild chimpanzees and capuchin monkeys
include youngsters encountering durable artefacts, most often in a supportive social context …

Animals (including humans) use objects to solve problems or accomplish goals in diverse
ways. Sometimes while doing so they achieve a mechanical effect on a target object or …

Body mass is fundamental for understanding growth, health, and aspects of life history but
records of body mass are rarely available for wild primates. We documented the body mass …

Testosterone and cortisol are hormones expected to play a major role in competitive
behaviours (ie aggression), and are related to rank and hierarchical stability. Through a non …

Culture extends biology in that the setting of development shapes the traditions that
individuals learn, and over time, traditions evolve as occasional variations are learned by …

Since group-living animals are embedded in a network of social interactions,
socioecological factors may not only affect individual behavioral strategies but also the …

Tool use is a fundamental feature of human evolution. Stone tools are in the archaeological
record from 3.4 Ma, even before Homo, 1 and the use of stone tools probably predated the …