Squid, Octopi, and Cuttlefish have chromatophore cells in their skin, which allow them to rapidly change their skins colour and texture. Here, take a look at what this baby octopus can do:
While they probably evolved these abilities for camouflage they seem to us them for communication to. This Humboldt squid is telling the cameraman 'back the hell off' by flashing rapidly from light to dark:
See - the Humboldt flashing is like Bruce Banner going green - it means 'time to go'.....
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