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In his 1890 book The Colours of Animals, he classified different types such as "special protective resemblance" (where an animal looks like another object), or "general aggressive resemblance" (where a predator blends in with the background, enabling it to approach prey).
His experiments showed that swallowtailed moth pupae were camouflaged to match the backgrounds on which they were reared as larvae.
Visual crypsis can be achieved in many different ways, such as by living underground or by being active only at night, as well as by a variety of methods of camouflage.
Some animals' colours and patterns resemble a particular natural background.
Non-military use of camouflage includes making cell telephone towers less obtrusive and helping hunters to approach wary game animals.
Patterns derived from military camouflage are frequently used in fashion clothing, exploiting their strong designs and sometimes their symbolism.
Among vertebrates numerous species of parrots, iguanas, tree-frogs, and the green tree-snake are examples".
Methods may be applied on their own or in combination.
Crypsis means making the animal or military equipment hard to see (or to detect in other ways, such as by sound or scent).
In the open ocean, where there is no background, the principal methods of camouflage are transparency, silvering, and countershading, while the ability to produce light is among other things used for counter-illumination on the undersides of cephalopods such as squid.
Some animals, such as chameleons and octopuses, are capable of actively changing their skin pattern and colours, whether for camouflage or for signalling.