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.
Hedgehogs are individuals, so some are more vocal than others. Hedgehogs make a variety of sounds as part of their way of communicating. Each of these sounds has a different meaning. Happy, content hedgehogs make a gentle purring sound, not unlike that of a cat.