Recognizing oneself in a mirror, for example, is a poorly understood but unmistakable sign of self-awareness, which is taken as a sign of high intelligence.

• 举例来说，照镜子时能够认出自己的影像，虽然学者还不太了解其中的奥妙，却亳无疑问是动物拥有自我意识的徵象，而拥有自我意识又是智能高的徵象。