They also walk on their hind legs.
At the end of the book, the pigs are behaving so much like humans that they begin indulging in drinking and smoking and playing cards. In short, the oppressed begin behaving like the oppressors.
The pigs also keep records and now resemble humans in their desire to document everything. They also begin wearing clothes. At the end of the novel, Orwell tells the reader that there is now no difference between pigs and men.
In chapter six, the pigs move into the farmhouse. They sleep in beds, as well. Since there was a commandment about this, they explain that while they are sleeping in beds, they are not using any sheets, and that was what the commandment was, notthe banning of beds. They further say that it is not any different than stalls, which of course, all the other animals are sleeping in. The pigs take on the human habits of habitation, while the other animals remain outside.