In the renxu 壬戌 year of the Zhengda 正大 era, the peasant population of Beishan 北山, in Neixiang 內鄉 (in present-day Henan province) reported that voles were eating their grain. The rodents were as big as rabbits, gathering in their tens and hundreds, and wherever they passed grain and millet simply vanished. When hunting households shot at them they took many heads, some of which weighed more than ten jin 斤, the colour of their coats being like that of otters. Rodents of such size have never before been seen.
Yuan Haowen 元好問, Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), 1.16:
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.) Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986)
 This is confusing. The Zhengda era declared by the Jin 金 polity ran from 1224 to 1234 CE. It does not seem to have included a renxu year; the first renxu year would have been in 1262.