The pigs do begin to appear to be more human, demonstrating the type of leaders they have become. The significance behind this, however, is less literal than that. It is important to note that Orwell chooses to portray the pigs in this way at the very end of the book to achieve one of his themes: that power may shift after a revolution, but oftentimes things will stay just about the same for the proletariat, or working, class. Power corrupts; as it did Mr. Jones in the beginning of the book, so it has the pigs. Life for the rest of the animals remains the same, or worse.