苏武
According to Chinese tradition, in the early stages of his captivity, Su Wu was so deprived of food that he only survived in the cold north lands by eating his coverings, then enduring long years of servitude herding sheep, before managing to return home. He was able to return home after deceiving his captors with a story about his having sent a message back to China by means of tying a letter on the leg of a wild goose.