We suggest that a multidisciplinary approach to teaching has potential to widen its scope. In that vein, we revisit our original claim that teaching is a natural cognitive ability among humans. We elaborate on three requirements for such an ability and report that, first, teaching strategies may be developmentally reliable. Findings indicate a possible normative developmental trajectory from age one year through adulthood. Second, teaching seems to be species-typical, that is, it is a universal human achievement. Third, human teaching with a theory of mind (ToM) is species-unique. Nonhuman animals may teach without a ToM.