Hate to be the person that poops on things, but only Druids can speak Druidic. Druids are forbidden to teach their secret language to others. "A druid who ceases to revere nature, changes to a prohibited alignment, or teaches the Druidic language to a nondruid loses all spells and druid abilities. (Including animal their companion)". I only know this because a DM looked it up to show me why another party member couldn't speak to my character in Druidic when other people were around that we didn't want to know our conversation. You can still have your character know Elven though, I don't think there are any restrictions on that, so our characters can still talk. :]