Nudibranchia
Nudibranchia, also known as sea slugs are a type of marine gastropod mollusk! They come in a huge variety of shapes, sizes, and colors. There are over 3,000 species and they can be found in both deep and shallow parts of the ocean.
Nudibranchia are bottom feeders and feed on other invertebrates. Some species of Nudibranch like the Blue Glaucus are venomous. The Blue Glacus or "Blue Sea Dragon" (Shown below) actually eats venoumous pray and steals their toxins!