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E-Mail IMAGE: Chimpanzees join their close bond partners - related group members and friends - to battle rivals. view more Credit: Liran Samuni, Taï Chimpanzee Project Chimpanzees, one of the closest relatives of humans, cooperate on a group level - in combative disputes, they even cooperate with group members to whom they are not related. Those involved in fights with neighbouring groups put themselves at risk of serious injury or even death. Within the context of the Tai Chimpanzee Project researchers observed three chimpanzee communities in Tai National Park in Cote d Ivoire documenting social relationships, territory range and intergroup encounters amongst others. We have been able to analyze almost 500 vocal and physical battles from the last 25 years with participation of at least one of the three habituated communities, some of which have caused severe injury or death , says Liran Samuni, the first author of the study. ....