Explaining the anatomical and physiological shifts of adolescence from an evolutionary perspective is rather simple: during the teenage years, the child becomes an adult capable of having her own children. That humans take so many years to be capable of reproducing is remarkable; that such change eventually happens is not. But what about adolescent behaviors? Why is the transition to reproductive maturity accompanied by such dramatic behavioral shifts, including behaviors that have the potential to put the developing adolescent at risk of dying before reaching full adulthood? Can the behavioral characteristics of adolescence be explained from an evolutionary perspective as easily as their physiological and anatomical counterparts?