Octopuses use coconut shells as portable shelters because their unusual nervous system prevents them from solving puzzles or escaping from tanks in other ways.
Octopuses are more intelligent than most invertebrates because, like humans, they keep most of their neurons in a large central brain rather than spread through their eight arms.
Octopuses show surprising intelligence, including problem-solving and tool use, despite a nervous system unlike ours, which suggests intelligence evolved more than once.
Research over recent decades has confirmed the traditional view that octopuses, like most other invertebrates, have very limited intelligence and cannot solve even simple problems.
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