In zoos, primates experience markedly different interactions with familiar humans, such as the zookeepers who care for them, compared to those with unfamiliar humans, such as the large volume of zoo v
Most mammals live in social groups in which members form differentiated social relationships. Individuals may vary in their degree of sociality, and this variation can be associated with differential
Facial width-to-height ratio (fWHR) is associated with social dominance in human and non-human primates, which may reflect the effects of testosterone on facial morphology and behaviour. Given that te
