![]() One of the few established tool use in wild chimps over a period of 25 years, showing that used materials remained consistent over time, despite large numbers of females leaving the group. There have been a number of studies showing social behaviour in animals, but there are very few that did so over a long period of time to show stability and longevity. The apes are known to be a cultural species, and the new study by University of Antwerp scientists focused on hand clasping in two different groups over 12 yearsįor a behaviour to be called ‘cultural’ scientists generally evaluate on three criteria: emergence through social learning, how it is shared among group members and how long it has stuck around within the group, or its longevity. Study authors also found that male chimpanzees would ‘grab wrists’ suggesting they were trying to assert control or dominance over their partner. This shows chimpanzees can adopt group-specific cultural practices and stick to them for extended periods, despite substantial population changes over time. The team looked at different styles of handclasp between the two groups and found ‘group belongingness’ is reliability identified based on the style of handclasp used. This is a peculiar social custom among the chimpanzee species which is linked to grooming, but only found in a relatively small number of chimp populations. The apes are known to be a cultural species, and the new study by University of Antwerp scientists focused on hand clasping in two different groups over 12 years. Chimpanzees clasp hands while grooming one another, and each group has its own distinct grip, which researchers say is similar to a ‘secret handshake’ in humans.
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