I have a player who wants to choose Auran as one of his bonus languages. He wants to choose this language because he is a Ranger and wants to be able to talk to his Raven companion. However I don't know if they can speak it. We are playing Pathfinder and the Rulebook states that Auran is spoken by flying creatures and air-based creatures. But beyond this, there is no extra explanation. I'm not sure if Ravens and other birds count, as I don't think they'd be intelligent enough to speak it. I've tried looking online but I can't find anything about it beyond what the rulebook states. Does anyone know more about this? Or is it left up to the DM?