The New York Times today has a report that includes this passage:
As in many other animals, communication among spotted hyenas serves different functions, including individual identification, recruitment of allies, reinforcement of social bonds among individual clan members, indication of social status, coordination of group activities and modulation of aggression among clan mates.
That long list often inspires people to ask why anyone thinks language is exclusive to humans. Readers of this blog can answer that it doesn't include the speech triangle (mutual contemplation of topics). Chomsky would point out the lack of structure and flexibility. Literary critics would mention the absence of voice and point of view.
Skeptics about exclusivity are often tempted to denigrate what language can do, but they are most persuasive when they point out how much animals can do. You've got to respect that kind of defense and know your own ground too..