Why would humans be any different than every other animal? We question this only because we arrogantly believe our form of communication, our language, is much more complexe than other animal species.
This has always been my view, too, on this subject. We like to think that "communication" is mediated by the accepted semantics of what we say - but at the same time our utterances, by their tone and timing, fulfill a lot of other functions related to defense of territory, mating, posturing etc., for which animals have specialised devices.