It is theorized that an octopus has an intelligence level equivalent to that of a dog. Octopi are high in protein and have no protective shell, thus making them an attractive meal for predators. They tend to travel alone, not in packs, so survival poses a complex challenge. They have been observed to use coconut shells as shelters, which is debatably considered tool use. In 1991, there was a documented instance of an octopus stacking rocks to create a barrier like a fort walls in an opening to a shelter.
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