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Octopuses May Owe Their Smartness To Extensive RNA Editing. The RNA Gets It’s Instruction Verbatim, From The DNA, For Producing Protein. Then, The Original Instruction Is Tweaked Such That Different Proteins (For Example, Protein That Can Aid The Octopus To Escape) Can Be Produced From The Same DNA Instruction.

Octopuses and squids can rewrite their RNA. Is that why they’re so smart? – The Washington Post

https://www.washingtonpost.com/news/speaking-of-science/wp/2017/04/06/octopuses-and-squids-can-rewrite-their-rna-is-that-why-theyre-so-smart/?utm_term=.15ff4289eada

Squids, cuttlefish and octopuses, which make up the smartest cephalopods, do not follow the normal rules of genetic information.