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Home | World | Study Reveals That Like Humans Aging Chimps Also Prioritize Friendships

Study reveals that like humans, aging chimps also prioritize friendships

By AFP
Published: Published Date - 02:33 PM, Fri - 23 October 20
The authors drew on a huge datasets of 78,000 hours of observations performed at the Kibale National Park in Uganda between 1995 and 2016.

Washington: When it comes to friendships, people are known to become more selective with age. It turns out the same is true of male chimps, who have fewer yet more genuine pals to ape around with as they get older, according to a study published in the journal Science on Thursday.

The research, which was led by animal psychologist Alexandra Rosati at the University of Michigan, was said to provide the first evidence that animals exhibit age-related social selectivity, and could help us understand more about why humans behave as they do.

The authors drew on a huge dataset of 78,000 hours of observations performed at the Kibale National Park in Uganda between 1995 and 2016. They reported on the social interactions among 21 wild male chimpanzees (Pan troglodytes) ranging in age from 15 to 58 years.

Males were chosen because they remain in the communities in which they are born, whereas the majority of females disperse to new groups when they become sexually mature. Aside from being our closest animal relatives, chimpanzees are an ideal species to compare to humans because they live long lives — sometimes until their 60s — and have a wide-degree of choice in whom they befriend.

Male friends groom one another, hunt and share meat together, collectively patrol the boundaries of their territories, and form alliances to attain and keep high rank in their groups, which in turn leads to more individual reproductive success.

To study their affinities for one another, the team developed an “association index” that was based on how often a male within a party was in close proximity (under five meters) to another, relative to how much they associated with all group members.

The team produced three categories: mutual friends, who both showed a preference for sitting with each other, one-sided friends where only one party showed a preference but the other did not, and non-friends where neither side preferred each other.

According to the findings, older males had significantly more genuine friendships than their younger counterparts, whose attempts at bromance were more often lopsided.

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