What you are protected by is restricted, and what can shield you from the wind and rain can also make you out of the day, right? 1/ Put the bird in a cage, the bird has an owner, and then the owner will tell the bird, if I hadn't fed you, you would have starved to death. As everyone knows, if you release the bird, the bird will also look for food, and there is no need to thank anyone. 2/ The pig does not understand until death what the relationship is between the person who ends its life and the person who gives it three meals a day.