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
M90 (camouflage) the brown color in the FOA camouflage). Navy blue was chosen instead of black because natural shadows generally tend to be in shades of blue to the human eye. The M90 combat clothing entered service during the late 1980s, with widespread use beginning the early 1990s. It replaced the earlier olive green M59 field uniform. The uniform is available in several different models. The changing missions for the Swedish armed forces, with a heavier emphasis on missions abroad, has led to two new models. M90 (camouflage) M90 camouflage is the camouflage pattern for the uniform system 90, used by the