Why are sea slugs so brightly colored?

Sea slugs, or nudibranchs, are brightly colored primarily as a form of aposematism, which serves as a warning to potential predators about their toxicity or unpalatability. Their vibrant hues can also help them blend into the colorful marine environments, providing camouflage among corals and other sea life. Additionally, these colors can play a role in attracting mates and communicating with other nudibranchs. Overall, their striking appearance is a combination of defense mechanisms and reproductive strategies.