Once, two researchers at the Seattle Aquarium conducted a test to see if octopuses could tell humans apart. Each day they more frequently approached their eight resident octopuses, with one scientist holding a bristled stick behind his back, to poke the octopuses with, and the other holding food. The researchers wore the same blue jumpers and were about the same height, and they also changed which side of the tank they approached, but in less than a week, the octopuses could distinguish them correctly. One even aimed its siphon at the researcher with the stick and squirted water at him, and
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