To survive, many animals stay as members of mixed-species associations. Indeed, there are a variety of social contexts in which two or more individuals belonging to different species must integrate their activities to achieve a common goal. The ability for heterospecific recognition and interspecific communication is the glue that holds these animal societies together. While we have been able to document a number of aspects of mixed-species associations, interspecific communication is a field of considerable debate as there is no concrete definition of what constitutes this type of communication. The field of interspecific communication awaits more research in the future especially because of close links between cooperative behavior and its cognitive demands.