The mimic octopus imitates other marine species by changing its shape, posture, and color. It can mimic a variety of animals, such as sea snakes, lionfish, and flatfish, by altering the texture and patterns of its skin. It may also mimic the behavior of these animals by changing its movements and body language. Overall, the mimic octopus is able to achieve such convincing imitations through a combination of visual and behavioral mimicry techniques.