Ever wonder why Han Solo speaks to Chewbacca in one language while his shipmate roars responses in another?
It's because Wookies don't have the organs necessary to speak Galactic Basic, the most common language in the Star Wars Universe. (No wonder Chewie seems grumpy all the time.)
You can find that fact and a slew of others in this infographic outlining the languages that were most commonly spoken a long time ago in a galaxy far, far away.
No word yet on when Rosetta Stone will start offering lessons in Jawanese - a language based on nonsense sounds mixed with pheromone scents.