FeiShu/飛鼠

In the Shanhaijing, there are also some descriptions of mythical creatures that are very realistic, like this one: Feishu is an animal there whose shape is like a rabbit but with a mouse’s head. It flies using its back.

《山海經·北山經》

又東北二百裏,曰天池之山,其上無草木,多文石。有獸焉,其狀如兔而鼠首,以其背飛,其名曰飛鼠。澠水出焉,潛於其下,其中多黃堊