Primate Sociality
See also: Altruism in animalsHumanity’s closest living relatives are common chimpanzees and bonobos. These primates are known to share a common ancestor with humans who lived four to six million years ago. It is for this reason that chimpanzees and bonobos are viewed as the best available surrogate for this common ancestor. Barbara King argues that while primates may not possess morality in the human sense, they do exhibit some traits that would have been necessary for the evolution of morality. These traits include high intelligence, a capacity for symbolic communication, a sense of social norms, realization of "self", and a concept of continuity. Frans de Waal and Barbara King both view human morality as having grown out of primate sociality. Many social animals such as primates, dolphins and whales have shown to exhibit what Michael Shermer refers to as premoral sentiments. According to Shermer, the following characteristics are shared by humans and other social animals, particularly the great apes:
- attachment and bonding, cooperation and mutual aid, sympathy and empathy, direct and indirect reciprocity, altruism and reciprocal altruism, conflict resolution and peacemaking, deception and deception detection, community concern and caring about what others think about you, and awareness of and response to the social rules of the group.
Shermer argues that these premoral sentiments evolved in primate societies as a method of restraining individual selfishness and building more cooperative groups. For any social species, the benefits of being part of an altruistic group should outweigh the benefits of individualism. For example, lack of group cohesion could make individuals more vulnerable to attack from outsiders. Being part of group may also improve the chances of finding food. This is evident among animals that hunt in packs to take down large or dangerous prey.
Period years ago | Society type | Number of individuals |
---|---|---|
6,000,000 | Bands | 10s |
100,000–10,000 | Bands | 10s–100s |
10,000–5,000 | Tribes | 100s–1,000s |
5,000–4,000 | Chiefdoms | 1,000s–10,000s |
4,000–3,000 | States | 10,000s–100,000s |
3,000–present | Empires | 100,000–1,000,000s |
All social animals have hierarchical societies in which each member knows its own place. 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. For example, chimpanzees are more likely to share food with individuals who have previously groomed them. Vampire bats also demonstrate a sense of reciprocity and altruism. They share blood by regurgitation, but do not share randomly. They are most likely to share with other bats have shared with them in the past, and who are in dire need of feeding as bats who haven't fed in three days risk death from starvation.
Animals such as Capuchin monkeys and dogs also display an understanding of fairness, refusing to co-operate when presented unequal rewards for the same behaviors.
Chimpanzees live in fission-fusion groups that average 50 individuals. It is likely that early ancestors of humans lived in groups of similar size. Based on the size of extant hunter gatherer societies, recent paleolithic hominids lived in bands of a few hundred individuals. As community size increased over the course of human evolution, greater enforcement to achieve group cohesion would have been required. Morality may have evolved in these bands of 100 to 200 people as a means of social control, conflict resolution and group solidarity. This numerical limit is theorized to be hard coded in our genes since even modern humans have difficulty maintaining stable social relationships with more than 100-200 people. According to Dr. de Waal, human morality has two extra levels of sophistication that are not found in primate societies. Humans enforce their society’s moral codes much more rigorously with rewards, punishments and reputation building. People also apply a degree of judgment and reason, not seen in the animal kingdom.
Read more about this topic: Evolution Of Morality