Camouflage the peacock flounder, squid and octopus actively change their skin patterns and colours using special chromatophore cells to resemble their current background, or, as in most chameleons, for signalling. However, Smith's dwarf chameleon does use active colour change for camouflage. Each chromatophore contains pigment of only one colour. In fish and frogs, colour change is mediated by the type of chromatophores known as melanophores that contain dark pigment. A melanophore is star-shaped; it contains many small pigmented organelles which can be dispersed throughout the cell, or aggregated near its centre. When the pigmented organelles are dispersed, the cell makes a
Underwater camouflage bottom-living fish such as the flounder can hide themselves effectively against a variety of backgrounds. Many cephalopods including octopus, cuttlefish, and squid similarly use colour change, in their case both for camouflage and signalling. For example, the big blue octopus, "Octopus cyanea", hunts during the day, and can match itself to the colours and textures of its surroundings, both to avoid predators and to enable it to approach prey. It can perfectly resemble a rock or a coral it is hiding beside. When necessary, in order to scare away a potential predator, it can display markings which resemble eyes. Like