Kanzi, the amazing bonobo, can use a keyboard to signal what she wants. And that's not all. Through her computer, Kanzi can "participate in four-way conversations," can "converse about objects, intentions and actions" and has even "acquired a theory of mind." Dolphins can't do all this, but they can "generalize," while elephants can "impart their wisdom" to the young. And then there is Hoover the seal, who can vocalize the following sequence of words: "Hey, hey, you, get outta there!" The scary thing is that Hoover and his like might be producing more meaningful, less admonitory sentences soon, at least according to Harvard biologist Tecumseh Fitch. "Maybe we just need to expose seals to human speech, and the right social context, and they'll be able to learn some speech." (link)
Everyone has little pieces of language. Humans, supposedly, have the whole thing.