What reasons does old major give that man is the biggest enemy?

Old Major argues that man is the biggest enemy because he exploits animals for labor and resources, taking the fruits of their work without giving anything in return. He highlights that humans do not produce anything themselves, relying solely on the animals’ efforts. Additionally, he points out that man creates divisions among animals to maintain control and prevent rebellion, ultimately ensuring that animals remain subjugated. Thus, Old Major calls for unity among animals to overthrow their human oppressors.