We often look to the behavior of chimpanzees and bonobos to infer the behavior of our ancestors. For example, male coalitionary aggression in chimpanzees is often taken to indicate violent tendencies in humans. Comparative data on bonobos provide a different picture that emphasizes peace and non-violence. However, both species have similar social structures. Males reside in the group their entire lives, females typically disperse and must integrate into a new community, and both have highly flexible, fission-fusion dynamics, in which animals join subgroups that frequently change. Although data from wild populations indicate sex-typical patterns of social bonds, understanding the extent to which captive groups exhibit those patterns can illuminate whether those sex differences are innate.
Chimpanzees 'have sex for gifts'
Chimpanzees 'have sex for gifts' - Telegraph
The role of biological and social influences on sex differences in human child development is a persistent topic of discussion and debate. Given their many similarities to humans, chimpanzees are an important study species for understanding the biological and evolutionary roots of sex differences in human development. In this study, we present the most detailed analyses of wild chimpanzee infant development to date, encompassing data from 40 infants from the long-term study of chimpanzees at Gombe National Park, Tanzania. Our goal was to characterize age-related changes, from birth to five years of age, in the percent of observation time spent performing behaviors that represent important benchmarks in nutritional, motor, and social development, and to determine whether and in which behaviors sex differences occur. Sex differences were found for indicators of social behavior, motor development and spatial independence with males being more physically precocious and peaking in play earlier than females. These results demonstrate early sex differentiation that may reflect adult reproductive strategies. Our findings also resemble those found in humans, which suggests that biologically-based sex differences may have been present in the common ancestor and operated independently from the influences of modern sex-biased parental behavior and gender socialization.
Sex Differences in Wild Chimpanzee Behavior Emerge during Infancy
Male chimps apparently can win over the opposite sex with the aid of fruit stolen from nearby farms and orchards. The discovery could shed light on the evolution of the sharing of food and more complex behaviors among humans, Hockings added. Over the course of a year, Hockings and her colleagues investigated how wild chimpanzees coexisted with people at the West African village of Bossou in the Republic of Guinea.