Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see (crypsis), or by disguising them as something else (mimesis).Examples include the leopard's spotted coat, the battledress of a modern soldier, and the leaf-mimic katydid's wings.features such as camouflage evolved by providing individual animals with a reproductive advantage, enabling them to leave more offspring, on average, than other members of the same species.
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In the 20th century, military camouflage developed rapidly, especially during the First World War.
On land, artists such as André Mare designed camouflage schemes and observation posts disguised as trees.
Grouse, if not destroyed at some period of their lives, would increase in countless numbers; they are known to suffer largely from birds of prey; and hawks are guided by eyesight to their prey, so much so, that on parts of the Continent persons are warned not to keep white pigeons, as being the most liable to destruction.
Hence I can see no reason to doubt that natural selection might be most effective in giving the proper colour to each kind of grouse, and in keeping that colour, when once acquired, true and constant.
A third approach, motion dazzle, confuses the observer with a conspicuous pattern, making the object visible but momentarily harder to locate.
The majority of camouflage methods aim for crypsis, often through a general resemblance to the background, high contrast disruptive coloration, eliminating shadow, and countershading.
Military camouflage was spurred by the increasing range and accuracy of firearms in the 19th century.