The two most common themes within Lord of the Flies are the battle between civilization and savagery and the loss of innocence. These common themes within Lord of the Flies are developed through the breakup of the tribe and the progression of the hunts:
In chapter 1, Simon, Jack, and Ralph find a piglet in the creepers. Jack fears killing it and claims he "was just waiting for a moment to decide were to stab him" (31). The civilized boys cannot remove civilized inhibitions so readily.
In chapter 3, Jack tracks a pig through the forest, but it escapes. Afterwards "Jack stood there, streaming with sweat, streaked with brown earth, stained by all the vicissitudes of a day's hunt" (49). Despite Jack's failure, he has obviously learned hunting skills. More importantly, he yearns to kill a pig, not only for the food, but for the knowledge of taking a life and spilling its blood. In a short amount of time, Jack has shed much of civilization's rules.
In chapter 4, Jack and his hunters kill their first pig. The hunters chant. The scene immediately before the hunt shows Jack crossing over from civilized to savage by making a mask, "a thing on its own, behind which Jack hid, (liberating him) from shame and self consciousness" (64).
In chapter 8, the hunters brutally slaughter a sow, place its head on a sharpened stick, and leave it as a sacrifice for the beast.
In chapter 9, the hunters make a circle and chant. This chant brought about "another desire, thick, urgent, blind. (152). The group chants "Kill the beast! Cut his throat! Spill his blood!" (152). Simon appears out of the forest and the mob of pretend hunters kill him. The savage boys can only be satisfied by blood, even human blood.
In chapter 12, Ralph becomes the hunter's prey as Ralph sharpens a stick at both ends. The hunters intend to sacrifice Ralph to the beast. Most psychologists would agree that once you begin sacrificing human heads to imaginary beasts, you've probably crossed over the line of savagery.