Octopus and cuttlefish have ability to turn invisible at will

Two types of cephalopods have the ability to turn their bodies almost invisible for camouflage. Because they live at varying depths in the ocean, these organisms need the ability to be invisible from prey in both light and dark environments. Their cells change color through muscular contraction, appearing translucent at depths with sunlight, and black or red at depths without light. Usually animals are confined to transparency or pigmentation, but these cephalopods have the ability to use both.