Chien Sung-tsun notes that the rhinoceros, for example--another large animal which was once found in China--was hunted in the turbulent Warring States period for its skin, which was used for armor. With this pressure, combined with changing climate patterns, by the Han dynasty it had already disappeared from China.
簡松村表示，比如原本也分佈中國的大型動物犀牛，歷經多戰亂的戰國時代，被捕捉作為盔甲，加上氣候的改變，在漢代就已從中國土地上消失。