Octopusus are preyed on by eels, dolphins, sharks and other large fish. Octopusus have a number of ways to prevent themselves from being eaten by these predators with the most noteworthy being the ability to camouflage itself quickly with the surrounding environment when a threat is imminent.
An octopus also has the ability to release a cloud of black ink to block a pursuing predators view. The black ink cloud released by octopuses includes the added benefit of containing a substance that reduces the sense of smell of any predators giving chase. Because they lack bones and have soft bodies, octopuses are also able to fit into small cracks and hide when being chased and can even sacrifice one of their arms if needed in order to escape the grasp of a hungry predator.