Word: wrangham
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...Wrangham, one of the world's leading authorities on primate behavior, spoke about his field research on the great apes of Uganda and the latest theories of human evolution, suggesting that human violence has an evolutionary origin...
...Wrangham's examples included rape and a behavior he terms "lethal raiding...
Chimpanzees, Wrangham said, will not attack unless the danger to themselves is negligible, and they become wildly excited during the attack...
This is significant, Wrangham said, because "humans and chimpanzees are the only two mammals that launch raids into other groups with the intent to harm the other group," Wrangham said...
...Wrangham suggested that lethal raiding might be related to hunting. In other words, nature selects in favor of the violent chimpanzee because that animal would be a more successful hunter. It might be possible, then, to substitute a rival of the same species for prey in the mind of the chimpanzee...