《水经注·卷三十七》
鹤级是山鸡，它的羽毛光彩鲜艳，色泽耀眼；爪子锋利，善于相斗。人们用家鸡和它对斗，就可以捕获。
光采鲜明，五色炫耀，利距善斗，世以家鸡斗之，则可擒也。
The crane is a type of pheasant. Its feathers are brilliantly coloured and dazzling to the eyes, and its claws are sharp and it is good at fighting. People can catch it by using domesticated chickens to fight it.