Abstract
Several species of primates transfer acoustic information to members of other species as well as their own species. This paper reviews some studies of interspecific information transfer by vocalization in primates and proposes the significance of it in cognitive ethology. There are three kinds of situation that interspecific information transfer occurs: 1) polyspecific association in grouping 2) sympatric species 3) competitors and predators. Some transfer patterns are mutually beneficial while others are parasitic. Interspecific information transfer is important as a key to study primate cognition because it could represent the ability of mental attribution. In this view, some plans for studies of intention are discussed.
