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ink sac


n.

An ink-containing organ located near the rectum in most cephalopods, including the octopus, squid, and cuttlefish.


 
 
Wikipedia: ink sac
Ventral view of the viscera of Chtenopteryx sicula
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Ventral view of the viscera of Chtenopteryx sicula

An ink sac is an anatomical feature, an ink-containing organ of a cephalopod (octopuses, squids and cuttlefish). This 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 is necessary to trigger an octopus to release its ink, as it is biologically costly to produce. Some species can even use their ink to stun or numb their predators.[citation needed]


 
 

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ink sac" Read more

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