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Chimpanzees Create Relationships Through Food Sharing
The hormone oxytocin plays a huge role in the formation of relationships. Just as the mother-offspring bond is flourished through the presence of oxytocin, oxytocin may play a role in promoting cooperative long term relationships among chimps.

The level of oxytocin in the urine of chimpanzee's are significantly higher in those that participated in food sharing. Food sharing is a less frequent behavior than grooming in chimps, however, it seems that it has a stronger effect on relationships.