Only once they are dead, then the flies lay their eggs on the little boys' dead bodies. The maggots which hatch from the eggs are the things that actually eat the dead flesh.
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In the Lord of the Flies after they eat the boys reenact killing the pig.
i guess its beast since Ralph and fatty wanted to get the idea of the presence of the beast out of the little boys' heads.
The boys in Lord of the Flies do not eat each other. There is no mention of canabalism in the book at all. The boys eat fruit, fish, crabs and the meat of pigs. During the attack on Simon, which led to his death, there is the mention of him being bit, and I quote, "There were no words, and no movements but the tearing of teeth and claws." This simply emphasises the savagery and ferocity of the boys attack but they were biting Simon, not eating him.
The boys are savages, so they don't control the flies. Also, the lord of the flies is far away from castle rock, so they don't have to deal with it.
On the island the boys initially ate fruits such as berries that they found or picked from the trees. However as the novel progresses, the boys learn to hunt, and they kill pigs to eat.