This sequence of events below was captured on video by Jessica Flack while she was collecting data on social dynamics at the Yerkes Regional Primate Research Center. It shows a fight erupting between an adult female pigtailed macaque and a juvenile. A second juvenile intervenes on behalf of the first. The female responds with aggression and then retreats. Many fights involve only two or three animals. However some can grow to include as many as thirty animals, consuming almost a third of the group.