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The Sand Octopus

Octopus kaurna lacks chromatophores like other octopuses. So it just burrows instead ๐Ÿ˜๐Ÿ™. Itโ€™s the only known octopus to bury itself completely like this.

The process begins with the octopus using its siphon to inject water into the sand, creating quicksand-like conditions which enable burrowing. Then, it uses its arms to burrow into the sand. Two arms will be extended to the surface, creating a ventilation shaft. At the same time, O. kaurna will use mucus to stabilize the shape of the burrow. Finally, the octopus will retract its two arms and push out loose sand with its siphon, creating a mucus-lined, ventilated burrow to rest in.

Octopus kaurna, Wikipedia