It's always the creepy little kids
"Get me the sugar!" called Jack's wife. His heart skipped a beat as he stood before the cabinet. Holding his breath, he slowly opened it.... Dangit! A baby!
An African tribe called the Ik throws their children out of their homes once they turn 3. They are left to fend for themselves with no help from their parents at all, and to survive, form groups with others their age. These groups only last a few years, and every so often the individual will join a completely different group.