As stated in the article, "each ape's social success depends on what other members of the group do, natural selection has favored the ability for social maneuvering and [ superior intelligence]" (2). Natural selection also favors monkeys because they are not the ones who linger or hold grudges against other monkeys when they get into feuds. Frans de Waal, a primatologist at Arnheim Zoo in the Netherlands, shows how natural selection has also promoted the ability to strengthen relationships with others. In his example, he tells of Mama, the most influential woman in the colony, who reconciled the other monkeys after they entered