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