They do this so that they can steal Piggy's glasses and use them to start their fires. Piggy gets very distressed after losing his glasses because without them, he can't see.
Sam'n'eric
Sam and Eric; the twins, also called Samneric in the book
The two boys who left Ralph's group to join Jack's group in "Lord of the Flies" are Sam and Eric, also known as Samneric. They were lured by the promise of hunting and adventure in Jack's group, which appealed to their primal instincts and need for excitement.
Maurice and Robert.
THE GRAINS GROUP, SILLY!
Samneric
Ralph
one of jacks group throws a big rock off the mountain and lands on Piggy's head and dies.
The Beatles?!
Jack's group steals Piggy's glasses and the conch shell from Ralph's group in the novel "Lord of the Flies." These items represent order, intellect, and democracy, which are valued by Ralph's group but rejected by Jack's group in their descent into savagery.
They do not have enough boys to keep taking turns and doing it on their own.
By creating a set of rules. After Ralph become their leader they create a set of rules, what/where the lavatory is, building shelters, fetching food, lighting the fire (fighting for rescue). This diminishes fast though. Also Ralphs group after the boys split combs their hair back (society influence tells you to do this) to prevent themselves from looking like jacks group (a pack of savages).