A marine animal similar to a squid with eight arms and two longer tentacles, known for changing color and releasing ink.
From Old English 'cudele' plus 'fish'; the first part may relate to 'cudgel' from the shape. The cuttlebone (internal shell) gave the creature its name.
Cuttlefish are probably the smartest invertebrates on Earth—they can solve puzzles, use tools, and change color in milliseconds by controlling millions of nanoscale color-shifting cells, yet they have no centralized brain.
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