"They are different from the ones back home, though. And," since Casper breached the topic, "you shouldn't tell anyone here, either. Because everyone here tries to not let mundane people know that magic and magic creatures and such exist. And they're really good at keeping it a secret and probably will kill you if you don't protect it, too." The last one is a deduction on her part, but the various groups have to have solid mechanisms in place to make sure that the secret doesn't get spilled, if all that secrecy worked for so long.