These tiny, electric-blue creatures are Blue Dragon sea slugs (Glaucus atlanticus), and while they are undeniably beautiful, experts warn that they pack a punch far above their weight class. The “Blue Fleet” ArrivesThe arrival of these “dragons” isn’t a planned visit. Known as the “Blue Fleet,” these surface-dwelling mollusks drift upside-down across the open ocean, carried entirely by winds and currents. When the summer heat meets our notorious South-Easterly winds, they often find themselves stranded on the Cape shoreline. The Electric Blue: Their vibrant blue side faces up, blending with the ocean surface to hide from birds above.