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
Disruptive Pattern Camouflage Uniform of changes. It is influenced partly by early US Jungle Camouflage patterns, such as "Duck Hunter"/"Frog-Skin". DPCU was developed following aerial photographs of the Australian terrain to determine which colours and patterns would be most suitable for camouflage uniforms. The selected five colour pattern consists of a greenish sand coloured background with randomly arranged spots of orange-brown, mid-brown, leaf-green and very dark green overlaid. While a mid-grey tone was included in early test uniforms, this was omitted in later uniforms in favour of a second brown tone. The standard DPCU works in areas from arid bushland through to tropical jungle