After Major's death, the pigs, led by Napoleon, Snowball, and Squealer, develop a new ideology called Animalism to organize and teach the other animals, though not all accept these ideas. The animals were motivated to rebel against their neglectful owner, Mr. Jones, as they suffered under his careless management. Key characters include the intelligent pigs, the faithful working-class animals, and Mr. Jones, whose irresponsibility prompted the revolution.