The Relationship between the Rise in Monogamy and Brain Size in Humans:

There is a positive correlation between monogamy and the brain size in most animals. This is mostly due to monogamous relationships being much deeper in connection as well as the advent of monogamy stopping most sexual competition and fighting, allowing for deeper connections within the group and increased survival of the group as a whole. This paper examines the relationship between monogamy and brain size in humans, looking through the lens of two main theories: the ecological theory and the social intelligence hypothesis. Through our most common mating system, our research suggests that a major reason for the evolution of intelligence and the increase in brain size is due to monogamy as a whole. The paper discusses the evolutionary advantage of monogamy and its relationship with brain size.