Bingo. This is creationist claptrap.
They are spinning evidence for evolution as evidence in their favor, and they're hoping people won't take the time to figure out what it all means.
If animals really have something in their brains capable of telling languages apart (because of the way they sound, etc.), it's probably because it serves some other function as well.
Which means that human capacity for language is not Irreducibly Complex according to Behe's definition that no "parts" of the whole may serve any other purpose.
Perhaps recognizing the vocalizations of a predator? Or even some form of rudimentary vocal communication between rats?