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After speculating about what enabled humans' ancestors to leave the rainforest (the use of roots as sources of water and food), Demonic Males next provides a catalog of the types of violence practiced by male chimpanzees (intragroup hierarchical violence, violence against females, and extragroup murdering raids). The high incidence of rape by ...
For instance, chimpanzees (Pan troglodytes) have patrilineal social systems, where the males usually remain in their natal groups and the females emigrate into neighboring groups. Conversely, in the matrilineal societies of bonobos (Pan paniscus), it is the females who remain in their natal groups and the males who disperse to new groups ...
Franciscus Bernardus Maria de Waal (29 October 1948 – 14 March 2024) was a Dutch-American primatologist and ethologist.He was the Charles Howard Candler Professor of Primate Behavior in the Department of Psychology at Emory University in Atlanta, Georgia, director of the Living Links Center at the Yerkes National Primate Research Center at Emory, [1] and author of numerous books including ...
All social animals have societies in which each member knows its own place. [citation needed] Social order is maintained by certain rules of expected behavior and dominant group members enforce order through punishment. However, higher order primates also have a sense of reciprocity. Chimpanzees remember who did them favors and who did them wrong.
The chimpanzees in the area have little fear of humans, because of a local legend, that humans and bonobos were cousins. "According to this belief, an older brother in a family of bonobos held to their traditional lifestyle and his descendants thus remained in the forest as bonobos. However, his younger brother was tired of eating raw foods.
He is co-director of the Kibale Chimpanzee Project, the long-term study of the Kanyawara chimpanzees in Kibale National Park, Uganda. [3] His research culminates in the study of human evolution in which he draws conclusions based on the behavioural ecology of apes. As a graduate student, Wrangham studied under Robert Hinde and Jane Goodall. [4]
Yerkes was a pioneer in the study both of human and primate intelligence and of the social behavior of gorillas and chimpanzees. Along with John D. Dodson, Yerkes developed the Yerkes–Dodson law relating arousal to performance. As time went on, Yerkes began to propagate his support for eugenics in the 1910s and 1920s.
Chimpanzees, bonobos, orangutans, capuchins, tamarins, wolves, elephants, ravens, and kea appear to understand the requirements of the task. For example, in a delay condition, the first animal has access to the apparatus before the other. If the animal waits for its partner before pulling, this suggests an understanding of cooperation.