《水经注·卷一》
据说狐狸这种动物听觉十分灵敏，它听到冰下没有流水的声音了，才敢过去；人们看到狐狸在走了，才也踏冰过河。我按《风俗通》说：俗语道，狐狸想渡河，但对尾巴却无可奈何。
人见狐行，方渡。余案《风俗通》云：里语称狐欲渡河，无如尾何。
It is said that this creature has very sensitive hearing. Only when it can hear that there is no running water under the ice does it dare to go across. People would not cross the ice until they saw that the fox had already gone across. I have recorded the following in the work "General Knowledge of Customs": The saying goes. "the fox wants to cross the river, but it doesn't know what to do with its tail."