The Japanese community is the largest octopi consumer. But not only humans, some other sea inhabitants eat them, too. The octopus's predators include moray and conger eels, dolphins and sharks. Whenever possible, the octopus will escape from its predators by shooting a jet of water through its body to create a burst of speed. Often, however, the octopus avoids detection completely. It can change its body color and texture so perfectly that it can virtually disappear. The colored pigment in its skin can be concentrated or diluted, forming stripes and patterns that blend into the environment. The octopus's ink sac also helps it avoid attack. It releases a disorienting black cloud that is accompanied by another secretion to dull the attacker's sense of smell.