Moving beyond consideration of mean gender di erences in bullying requires carefully considering where gender di erences do and do not exist. For a large, nationally representative United States sample, Nansel et al. (2001) found that boys reported perpetrating and being victimized by bullying more than girls. When speci c forms of victimization were examined, boys reported experiencing more physical bullying than girls, and girls reported more bullying by rumors and sexual comments. In another U.S. study, 4th and 5th graders responded to a survey about “Who bullies whom?” (Rodkin & Berger, 2008). Boys were more likely to be bullies and bully-victims, and girls were more likely to be victims. In a study of developmental trajectories for bullying from ages 10 to 17 with a large Canadian sample (Pepler et al., 2008), the high and moderate bullying trajectory groups included more boys than girls, and the trajectory group for low involvement included more girls than boys.