One approach to answering this question is to examine the factors that might have shaped other creatures that show high intelligence and to see whether the same forces might have operated in our forebears 为了回答这个问题，科学家想到一个方法，就是观察其他智能高的物种，分析塑造?们智能的因素，再研究那些因素是否也影响了我们的祖先。
