Mystic Dolphins look like regular dolphins at first, but you'll notice their powers once they use them on you. They can alter your vision for you to see pretty much anything. Although commonly, they make you see a great white shark in place of themselves, so you go away from them. They can also cause blindness, which is only permanent as long as you are near them.
Mystic Dolphins so far:
(ask Stuffing to make a mystic dolphin for your menagerie or an already existing menagerie)