Recently available social scientific evidence suggests strongly that harmful aggressive behavior by mentors aimed at their mentees(mentor-on-mentee-aggression, or MOMA) is a common occurrence in such relationships. This paper seeks to characterize such aggression and to account for its persistence by means of confluence of three etiological perspectives: ethological (mentoring as a form of “alloparenting” and as a form of coalition building), broadly evolutionary (MOMA as a form of “handicap” attaching to the bonds that constitute mentoring coalitions), and psychodynamic (MOMA as (...) a function of “normal narcissism”). The net result is that MOMA is an expectable feature of most mentoring relationships. (shrink)