Yeah, probably. I've even written a couple of stories that involved Princess Celestia doing that with my OC.
They're in my gallery, if you wanna check them out. The shorter one is called "Lessons Of The Mind". "Chaos Now!" is longer, and subdivided into several chapters. It's also loosely based off of the movie "Apocalypse Now!"
Hehe, The Princess is going on one of her lectures. So 'THAT'S' where Twilight got it from.
Me? I think they can communicate with any pony they wished.
They're in my gallery, if you wanna check them out.