When gender specific forms of aggression are considered, there is evidence to suggest that girls are as aggressive as boys
(Moretti and Odgers, 2002). Girls tend to engage in relational aggression while males tend to display overt aggression, both forms of aggression are equally hostile.
The results of pre-school studies indicate that girls display higher levels of relational aggression than boys
, and the gender difference is well established by middle childhood. Onset and developmental trajectories are different between boys and girls. Although boys exhibit more physical aggression in early childhood, which decreases over time, girls display the opposite pattern, with low levels of aggression during early childhood only to peak much later (Moretti and Odgers, 2002).