Ink sac

Encyclopedia : I : IN : INK : Ink sac

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.

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.