Octopuses are highly intelligent and resourceful creatures. In certain situations, they may find themselves in a tight spot, facing a predator or caught in a difficult situation. When feeling threatened or stressed, an octopus can engage in autotomy, a fancy word for the act of intentionally detaching a body part—in this case, their own arm....
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( http://www.musiya.ng/2024/02/why-do-octopuses-eat-their-own-arms.html )