"Well, you figured out how to recognize vampires on your own I guess." Those are the most obvious. "Werewolves... they have some forms that are kind of between wolf and person, I think, and that's probably the most clear way to recognize them. You might be able to smell something, though? Sin-Eaters can recognize each other, but there's probably not a good way for you to recognize them. And... well, Hunters are human."