[agency]

FWIW I think that behavior may be specific to the Giant Pacific octopus[1]. I'm not sure if other octopuses (octopi? octopodes?) behave the same way.

[1] https://en.wikipedia.org/wiki/Giant_Pacific_octopus

[therein]

As far as my understanding goes, the octopuses that don't exhibit that behavior are the exception to the rule instead.