Already in kindergarten we see relationships forming among children who are rejected. By default they associate with each other and you don't recognize them as having delinquent gangs by age five or six. But they grow older together and by adolescence they can roam around more freely. They can associate more freely and then it snowballs. Their victims also show up at an early age.
Some researchers say yes.
But Tremblay says the data is inconclusive, especially in relation to gang behaviour. In elementary schools, the girls who are highly physically aggressive, compared to other girls, are still much less so than the most aggressive boys. Craig says female aggression manifests itself differently. Their forms of aggression are more severe. There may be the same amount as in girls, but it is more effective.