Chimpanzees in the wild, just like humans, seem to learn skills from each other and improve their skills from generation to generation.

In particular, young females who migrate between groups bring cultural knowledge with them, allowing groups to combine new and existing techniques to become better at foraging. Such “accumulated culture” means that some chimpanzee communities are becoming more technologically advanced over time, even if very slowly, he says. Andrew Whiten At the University of St. Andrews, UK.

“If chimpanzees have cultural knowledge that the community they migrate to doesn’t have, they may pass it on in the same way they pass on genes,” he says. “And that’s where the culture is built.”

Scientists already knew that chimpanzees use tools in sophisticated ways and can pass on that knowledge to their offspring. However, compared to humans’ rapid technological development, chimpanzees did not seem to have advanced in previous technological innovations, Whiten said. The fact that chimpanzee tools are often made from biodegradable plants makes it difficult for scientists to track chimpanzee cultural evolution.

Cassandra Gunasekaram Researchers at the University of Zurich in Switzerland thought they might be able to apply genetic analysis to this puzzle. Male chimpanzees remain in their home regions, but young females leave their home communities to search for mates elsewhere. She wondered if these women were bringing their skill sets to the new group.

To find out, she and her colleagues obtained data from 240 chimpanzees representing all four subspecies. previously collected by other research groups At 35 research facilities in Africa. The data included precise information about what tools, if any, each animal used and their genetic connections over the past 15,000 years. “Genetics gives us a kind of time machine to see how culture was transmitted among chimpanzees in the past,” Whiten says. “It’s quite a revelation to have new insights like this.”

Some chimpanzees used complex combinations of tools to hunt termites, including drill rods and fishing brushes made by pulling plant stems between their teeth. The researchers found that even if they lived thousands of miles apart, chimpanzees with the most advanced tool sets had the same level of performance compared to chimpanzees that used simple tools or chimpanzees that did not use any tools at all. They found that they were three to five times more likely to share DNA. Also, the use of advanced tools is more strongly associated with women’s migration compared to the use of simple tools or no tool use.

“Our interpretation is that these complex toolsets were actually invented, perhaps building on earlier, simpler forms, so we learned from the community that first invented them and from all the others along the way. “We need to rely on women’s transmission to communities,” she says. Whitens the skin.

“This shows that complex tools rely on social interactions between groups, which is very surprising and interesting,” says Gunasekaram.

thibault gruber The University of Geneva professor said he was not surprised by the results, but said the definition of complex behavior was debatable. “Having worked with chimpanzees for 20 years, I would argue that cane use itself is complex,” he says.

For example, his own team discovered what is called a cumulative culture of chimpanzees that make sponges from moss instead of leaves. This is not very complicated, but Works more efficiently to absorb mineral-rich water from the clay pores.. “It’s not a matter of more complexity, it’s just that some technologies build on previously established technologies,” he says.

Gunasekaram says that cumulative culture in chimpanzees is still significantly slower than in humans, likely due to differences in chimpanzees’ cognitive abilities and lack of language skills. Additionally, chimpanzees interact far less with others outside their community than humans, and have fewer opportunities to share culture.