Octopuses are known for their astonishing ability to rapidly shift their skin color and texture, to hide from predators, to sneak up on prey and to communicate with each other. But what exactly is going on when octopuses change color in their sleep? Footage that recently circulated on Twitter offered a rare glimpse of a Caribbean two-spot octopus (Octopus hummelincki) sleeping out in the open in its well-lit aquarium. And as it snoozed, the cephalopod's skin color changed dramatically, from light to dark and back to light again. [8 Crazy Facts About Octopuses]
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