Octopuses Have Massive Brains
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Octopuses are a part of an elite group of mollusks known as cephalopods, ranging from giant squid to nautilus. This smart group of ocean-dwellers is known for their incredibly large brains and their lack of a spinal cord. Over the years, octopuses have proven their ability to navigate through mazes, solve problems, and they have sharp memories.
Also, the fact that they play is a sign of intelligence, because playing and socializing are activities that intelligent animals do. It means that they are thinking about keeping themselves preoccupied which takes a higher level of mental cognition. Octopuses also have personalities which can be studied by observing them on a day-to-day basis and watching how they react to certain situations.
