Ink sac

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink.

Excerpt from the Wikipedia article “Ink sac”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hugh Chisholm, editor, Public domain, via Wikimedia Commons.