Sea slugs don’t shy away from the fish, crabs, sea turtles, or even other sea slugs that might want to take a bite out of them. Instead, the brightest and most patterned sea slugs are more active during the day. A panel of dorsal shots of all 45 species of sea slugs that we examined in the study. The team used special cameras and software to simulate what the sea slugs would look like to a potential predator. Nocturnal sea slug predators are less likely to use their vision to hunt overnight, when the senses of touch and smell are more important.