There is a progression in hunting that mirrors the deconstruction of civilization on the island. The boys begin by mock or play hunting and then they kill a pig. The next progression is the killing of the sow, which is especially disturbing. Golding uses rape imagery to describe the kill. If you examine it again, you will see. The boys are not content to simply kill the sow. They abuse it with brutal sexual undertones before they savagely slaughter it. The final progression is the killing of humans. Piggy and Simon are killed and they effectively hunt Ralph at the end of the book.