Other work has shown Viking genetic signature from the frontiers of their empire, such as the Scottish Western Isles, the Isle of Skye and Iceland, which fits the popular image of male invaders who took local wives. And studies of chimpanzees suggest that the urge to go to war is lies in our genes.
Now a Californian team has studied the evolutionary forces that shaped the need for males to be belligerent, which raises their probability of trying to conquer neighbours, and of bravery, which increases the probability of succeeding in conquest.
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