Masters of Disguise
Rather than just using camouflage to evade predators, the Indonesian mimic octopus can shape itself after various toxic creatures. These masters of disguise can also outswim their adversaries by growing larger arms. Other cephalopods, like the cuttlefish featured in the video below, activate color sacs known as chromatophores to flash different colors.
Image: Blue-ringed octopus. (Wikimedia Commons) Video: Cuttlefish (NOVA/PBS)