 The red colobus monkeys have adapted their behavior by joining troops of green monkeys that are near the potential red colobus troops that they wish to join, and living amongst them in order to spy on their potential new families.In one notable case, an adolescent male red colobus spent two years with a green monkey troop in order to spy in safety on a prospective troop in this manner.The diet of red colobus monkeys consists mainly of young leaves, flowers, and unripe fruit.