study of the Max Planck Institute for Evolutionary Anthropology (Leipzig, Germany) has confirmed the existence of ties trust between chimpanzees considered friends , which suggests, according to the authors, these feelings have a long history behind it.
The study, published today in the journal “Current Biology”, started from the premise that humans, in important moments, rely heavily only his closest friends.
“In our study we investigated whether chimpanzees show a similar pattern and provide confidence selectively to those individuals who are united more closely. Our results suggest that Thus, “says researcher Jan Engelmann.
Her work reveals that current characteristics of human friendships have detected parallels in social ties among primates.
Previous research had already found similar to the friendship between chimpanzees, animals, for example, prefer some of their counterparts on other relationships.
In the Max Planck Institute decided to check if those relationships based on trust and observed for five months interactions fifteen chimpanzees in Kenya to identify, from their daily behavior, who could be considered a friend of whom.
then they raised them a game in pairs, that a chimp could choose between pulling a rope with which immediately getting a few pieces of fruit, or pull another that gave his partner a hearty spoils of bananas and apples, but would only have access to the first if its colleague decided to share it.
Each chimpanzee played twelve times with a “friend” and twelve with a “no friend” and found to be much more confident in the first.
“The chimpanzees were much more likely to make resources available to your partner and chose the risky option, but potentially more profitable, when interacting with a friend, “the researchers emphasize.
According to Engelmann, believe that chimpanzees emotional and lasting ties with specific individuals shows that “human friendship does not represent an anomaly in the animal kingdom” EFE
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