The nine-tailed fox is a mystical animal. In terms of appearance, it is red in colour and has four feet and nine tails. It emerged from the Realm of the Green Mound. Its cry is like that of a baby. Eating it will prevent a person from encountering noxious or demonic energies; it also serves a kind of poison.
Li Fang 李昉, et al., Taiping guangji 太平廣記 (Extensive Gleanings from the Era of Great Harmony), 10 vols (Beijing: Zhonghua shuju, 1961), ix, 447.3652:
 Qingqiu 青丘 was regarded as a place in the far east, beyond the seas.
 In this context the choice of the title ruiying 瑞應, which usually refers to auspicious portents resulting from virtuous rule, is a little confusing.