http://www.factzoo.com/sites/all/img/invertebrates/mollusks/glaucus-atlanticus.jpg
This badass looking creature is called the Blue Dragon, it's a sea slug that preys on the Portuguese Man O' War, which just so happens to be over 1000 times its length. It then takes the poison from the Man O' War and concentrates it in its tendril hand thingys, making it actually more poisonous than the Man O' War because the poison is concentrated. It also looks cool as fuck.