Order Nudibranchia is a classification of sea slugs that are known for their vibrant and captivating colors and patterns. These intricate creatures are often referred to as "naked gills" due to the fact that their respiratory organs are exposed on their backs. While Nudibranchia is the official scientific name for these marine invertebrates, there are several synonyms that are commonly used to describe them. These include the terms sea slugs, sea hares, and sea butterflies. Regardless of what name they go by, Order Nudibranchia encompasses a diverse group of creatures that are sure to captivate anyone who has the opportunity to witness them in their natural habitat.