Thus the animals lived happily. Yang Tien-shu notes that it is very important for pigs, which are social animals, to be able to give vent to their emotions and to have a stimulating environment. Bored pigs will bite each other's tails and ears or even eat their own droppings.
楊天樹說的有趣，對豬來說，適當的心靈發洩與生活的「活潑化」很重要，否則它們窮極無聊時會互咬尾巴、耳朵，甚至吃自己糞便。