Chimpanzees showed a comparable pattern and extended trust selectively toward those individuals they are closely bonded with, the findings revealed.

Experimental interactions between the chimps showed much greater trust between friends than non-friends, the researchers said.

To find out whether the interactions between chimpanzees were based on trust, the researchers observed the interactions of 15 chimpanzees living at Sweetwaters Chimpanzee Sanctuary in Kenya over a five-month period.

Based on friendly interactions among chimp pairs, including grooming and eating together, the researchers identified each chimpanzee had a closest 'friend' and a 'non-friend', the findings published in the journal Current Biology, showed.


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