Attack, Kill, Expand, Share

Study says chimpanzees attack and kill others for more resources or mates.

"Mitani warns against using the research to draw conclusions about warfare among humans, instead arguing that his study provides insights into primate teamwork. "Warfare in the human sense occurs for lots of different reasons. I'm just not convinced we're talking about the same thing."

"He added: "What we've done at the end of our paper is to turn the issue on its head by suggesting our results might provide some insight into why we as a species are so unusually cooperative. The lethal intergroup aggression that we have witnessed is cooperative in nature, insofar as it involves coalitions of males attacking others. In the process, our chimpanzees have acquired more land and resources that are then redistributed to others in the group.""

Compare the chimpanzee with another close primate relative, the bonobo. "No bonobo has ever been seen to kill another bonobo."