A sea slug is a soft-bodied marine mollusk that belongs to the class Gastropoda. They are known for their vibrant colors and unique shapes, which help them blend into their surroundings or warn predators. Sea slugs can be found in oceans around the world, often in shallow waters, and they feed primarily on algae, sponges, and other small marine organisms. There are many different types of sea slugs, including nudibranchs, which are particularly colorful and often have intricate patterns. These creatures breathe through gills located on their backs and can also absorb oxygen directly through their skin. Sea slugs play an important role in marine ecosystems by helping to control algae populations.