[nullsanity]

For anyone else whom the above awnsers absolutely nothing without googling what defines the boundary - A more verbose version of the above comment is that they communicate only simple, situational signals (like warning cries or information for action) and not using a symbolic, rule-governed system capable of abstraction, past and future tense, and infinite combination.

Of course, with all generalizations, this is sort of a lie, but no - whales, chimps and cephapods don't meet the official bar.