Special Language or Babble?

There is some notion that twins can have a special language. I haven't actually met any twin parents who say that is the case with their twins, but maybe I haven't met enough parents with older twins.

In any case, both Elizabeth and Miranda have the same word for cat or Zeke or kitty. It sounds nothing like cat or Zeke or kitty and it sounds nothing like anything else I call Zeke ("little bastard" or "crazy mother f$&%@er"). Everytime they see him, they exclaim, "Da Dert" in a high pitched voice and run in his general direction. I've really been trying to figure out what they are saying, but I have no clue. But they both say it. Exactly the same. Every time.

Oh, and even da dert loves the trampoline.