A Blue Sea Slug, Glaucus Atlanticus

While taking a swim in the tropical or intemperate waters of the World Ocean be cautious if meeting a tiny blue or blue-white sea creature, resembling a tiny fairytale dragon. It is a blue sea slug, also called a blue dragon belonging to the Glaucidae family of  gastropod mollusks. Glaucus atlanticus, which is a scientific name for a blue sea slug, is a tiny, only about 1.2 inches in length, but a highly venomous creature.