A marine mollusc related to squid and octopus, known for squirting ink and having a chalky internal shell called a cuttlebone.
From Old English 'cudele' or 'cuttel,' possibly from Latin 'cutis' (skin) or related to Old Norse 'kuttill.' The word entered English before the Norman Conquest.
Cuttlefish have three hearts, blue blood, and can change color and pattern in milliseconds—they're basically aliens living in Earth's oceans, and they're smarter than most animals on land.
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