Nudibranchs

Called Nudibranchs or sea slugs, there are over 3,000 species of them throughout the world's oceans, and they come in any color or color combination that you can think of. A member of the order of gastropods, they are similar to a garden slug, but aren't really slugs at all. They do crawl slug-like, but they can also swim short distances. Nudibranch means "naked gills" in ancient Greek, because the majority of them have exposed organs on their backs which they breathe through. They range in size from a half-inch to 20 inches in length, and with their vibrant colorful tones, they really aren't what we should call a slug.