Nudibranchs, also known as sea slugs, are beautiful and colorful creatures in the ocean. With over 3,000 species, they are known for their vibrant colors and patterns. These mollusks have unique defense strategies, including camouflage and toxicity to protect themselves from predators. Nudibranchs also serve as indicators of ocean health, providing insights into marine ecosystems. Celebrating National Sea Slug Day on October 29 highlights the importance of conserving these fascinating animals.