Birth control pills have not been shown to get rid of or shrink ovarian cysts that have already formed. Some studies show that the cysts shrink at the same rate with or without birth control pill use.
Chewbacca's voice was created by the original films' sound designer, Ben Burtt, from recordings of walruses, lions, camels, bears, rabbits, tigers, and badgers in Burtt's personal menagerie. The individual recordings were mixed at different ratios for Chewbacca's different utterances.
1 They hiss - sounds much the same for most species, with a few exceptions. The sound a rearing Indian Cobra makes, for example, sounds like a muffled sneeze.  They have a sound producing organ - the obvious example of this is the North American rattlesnake.