It would be possible to define a language even more restrictively: as a set of semantically interpreted well-formed formulas used for communication. It would then be true by definition that language and communication were inextricably linked. However, the definition itself would have to be motivated. In science, a definition is motivated when it groups together properties which are systematically linked in nature. Our point is precisely that the property of being a grammar-governed representational system and the property of being used for communication are not systematically linked. They are found together in the odd case of human natural languages, just as the property of being an olfactory organ and the property of being a prehensile organ, though not systematically linked in nature, happen to be found together in the odd case of the elephant’s trunk.