It is one of the oldest mysteries in science.
Octopuses might be nature's ultimate weirdos: They have squishy bodies that can squeeze through tiny cracks; eight sucker-covered arms that can be regrown; three hearts that pump blue blood (rich in copper) through their veins; and massive, donut-shaped brains that give them superior intelligence compared with other invertebrates. But octopuses' most awe-inspiring trait is arguably their ability to rapidly change color and blend into their surroundings, camouflaging themselves at will.
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