Humans and chimpanzees recently evolved a more active fight-or-flight response compared to other primates, possibly in response to the threat of warfare, finds a new study. Macaques and some bonobos lack these genetic variants that may increase the fight-or-flight response.

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Humans and chimpanzees recently evolved a more active fight-or-flight response compared to other primates, possibly in response to the threat of warfare, finds a new study. Macaques and some bonobos lack these genetic variants that may increase the fight-or-flight response.