Octopuses are masters of disguise and escape. The soft-bodied cephalopods are tasty, easy-to-eat treats formarine predators, so they've41a number of interesting tricks for evading their hunters. For one, they'reable to change not only the color but also the42of their skin. This allows them to instantly camouflagethemselves as almost anything, from rocks to other animals. What's more, they're extremely43and usethis capability to squeeze into safe hiding spaces or escape dangerous situations. If these two approaches fail,almost all octopus species are capable of producing jets of black ink to confuse and distract their predators.Even at rest, octopuses do something a bit surprising--they dream in their sleep. Like human sleep, octopussleep has two stages: quiet and active. And just as humans do, octopuses show44of dreaming duringactive sleep. Their limbs twitch, they breathe more rapidly, and colors flash across their skin. Scientists aren'tsure45octopuses dream. Some suggest it might help them improve their camouflage techniques, andothers think it could enable them to review and learn from past experiences. Perhaps one day, scientists will beable to fully understand these complex creatures.