Some of them feed on cnidarians, whose toxins do not harm the snail. Instead, the eaten cnidarians are transported through the snail's digestive system and placed at the back of its back, where they play a protective role. These snails can also camouflage themselves to avoid being eaten or produce special mucus that is released when the snail is touched. Some nudibranchs can produce sounds audible to the human ear. All representatives of nudibranchs are hermaphrodites, but they are unable to fertilize themselves.
