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* small, elastic pigment-filled dermal sacs called Chromatophores which enable the blue ringed octopus to change colour rapidly and in elaborate patterns to mimic the surroundings.

* the ability to also change the texture of its skin to resemble a variety of backgrounds including sand, rocks and reefs, spiky coral and even seaweed.

* a small, vestigal ink sac that produces highly concentrated black ink as a globule or as a cloudy stream.

* advertising the toxicity of blue ringed octopus by displaying iridescent blue rings when it is about to attack.

* use of jet propulsion to flee an area.

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14y ago
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