In Lord of the Flies, Ralph is the natural leader and democratically elected when the boys must choose between him and Jack.
Ralph lets Jack, who is naturally inclined towards this type of survival, lead the hunters. He is relieved to do so. Jack is the head of the choir so the fact that he already has a group of dedicated followers who have become the hunters allows Ralph, Piggy and Simon to primarily organize the shelter and the signal fire.
A search is called in order to look for the "beast" and Piggy is assigned to stay behind to care for the 'littleuns.' Ralph leads the search but is happy to relinquish this responsibility to Jack, to whom it comes so naturally. When Jack hesitates, Ralph goes first but Jack, to redeem himself follows
“Couldn’t let you do it on your own.”
Jack is immediately inspired by the newly discovered "fort" and can't wait to set up there. Ralph, on the other hand, has returned to thoughts of the signal fire and rescue.
Ralph, therefore, retains leadership overall but Jack is in charge of the hunting. This will eventually lead to Ralph losing his control over the group as the boys descend further into savagery.