Active camouflage the surface, so when marine animals are seen from below, they appear darker than the background. Some species of cephalopod, such as the eye-flash squid and the firefly squid, produce light in photophores on their undersides to match the background. Bioluminescence is common among marine animals, so counterillumination may be widespread, though light has other functions, including attracting prey and signalling. Color change permits camouflage against different backgrounds. Many cephalopods including octopuses, cuttlefish, and squids, and some terrestrial amphibians and reptiles including chameleons and anoles can rapidly change color and pattern, though the major reasons for this include signalling, not
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