Camouflage 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. It is possible that some plants use camouflage to evade being eaten by herbivores. Military camouflage was spurred by the increasing range and accuracy of firearms in the 19th century. In particular the replacement of the inaccurate musket with the rifle made
Military camouflage dropped altogether. Late in the Second World War, the USAAF abandoned camouflage paint for some aircraft to lure enemy fighters to attack, while in the Cold War, some aircraft similarly flew with polished metal skins, to reduce drag and weight, or to reduce vulnerability to radiation from nuclear weapons. No single camouflage pattern is effective in all terrains. The effectiveness of a pattern depends on contrast as well as colour tones. Strong contrasts which disrupt outlines are better suited for environments such as forests where the play of light and shade is prominent, while low contrasts are better suited to