Answer:
At the end of Animal Farm, after the Animalist inscriptions were changed by the pigs to say that some animals were "more equal than others", the pigs decided to open conversation with the human farmers around them. As the other animals looked in at the meeting, they couldn't tell which figures were human and which were pigs. By the name of the farm changing back, the author makes the point that the farm was the same in the end as in the beginning. Fairy tales are often used to teach children important lessons, and in presenting this tale as a fairy tale, Orwell intends to teach us, the readers, a lesson. Pigs often have a negative symbolism in modern literature. They are known as sloppy and dirty. People who don't like the police call them "pigs". The enemies in Angry Birds are pigs. So in using pigs as the antagonists, Orwell makes a point about communist leaders.
Hope this helps, edit before submitting