 Additionally, pro-social behaviors in cooperative breeding in humans had a by-product effect of enhancing cognitive capabilities, especially in social tasks involving coordination.Human mother's tend to have overlapping, dependent offspring due to shorter interbirth intervals, high fertility rates, and low infant mortality rates, thus imposing high energetic costs.Unlike other species with cooperative breeding systems, human female "helpers" do not incur the cost of reproductive suppression at the benefit of a single, dominant breeding mother.