Like its close relatives, the squid and octopus, the cuttlefish is equipped with an ink sac that can help it make a last-ditch escape from predators that hunt by sight. The cuttlefish can eject its ink in two ways. One way creates a smoke screen behind which the animal can escape perceived danger.
Why do cuttlefish release ink?
Squids and other cephalopods, such as octopi and cuttlefish, use ink to confuse their predators and thereby escape from them. … The water helps to distribute the ink, and increasing the amount of mucus helps the dark cloud that is released retain a shape that looks similar to the squid.