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An ink sac is the anatomical feature, an ink-containing organ of a cephalopod (octopuses, squids and cuttlefish). The ink sac can release an inky fluid from a duct opening at the base of the siphon in order to confuse its enemy or prey, or as cover to escape. A general level of provocation will be necessary to trigger octopuses to release its ink, which is biologically costly to produce. Some species can even use their ink to stun or numb their predators.^{[citation needed]}