Hostility towards outsiders is characteristic of both human and non-human animals.
对外来者怀有敌意是人类和其他动物共有的特征。
柯林斯高阶英语词典
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It's not only the study of human population, but the populations of non-human species, including viruses like influenza, the bacteria in your gut, plants that you eat, animals that you enjoy or that provide you with meat.