Mouse
Because the mouse is as small as a pocket, it is very vivid.
According to ancient Chinese books, the ancient Central Plains region initially used the "stem and branch chronology method", which used the 10 celestial stem symbols (A, B, C, D, Wu (wù), Ji, Geng). (gēng), Xin, Ren (rén), Gui (guǐ) and the 12 earthly branch symbols (Zi, Chou, Yin, Mao, Chen, Si (sì), Wu, Wei, Shen, You, Xu, Hai) At the same time, some people also used the twelve animals to record the year simply. By the Sui Dynasty, the Central Plains calendar was spread to the nomadic people in northwest China, and they only adopted the twelve animal calendar methods.