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
Underwater camouflage breaking up their outlines with strong contrasts. Fish like "Heniochus macrolepidotus" have similar bands of colour that extend into fins projecting far from the body, distracting attention from the true shape of the fish. Some fish which mimic seaweeds such as the frogfishes "Antennarius marmoratus" and "Pterophryne tumida" have elaborate projections and spines which are combined with complex disruptive coloration. These have the effect of destroying the signature "fish" outline of these animals, as well as helping them to appear as pieces of algae. A variety of marine animals possess active camouflage through their ability to change colour rapidly. Several