Camouflage

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This article is about a form of protective coloration. For other uses, see Camouflage (disambiguation).

The peacock flounder can change its pattern and colours to match its environment.
photo of a soldier putting on camouflage face paint
A soldier applying camouflage face paint; both helmet and jacket are disruptively patterned.

Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the

battledress of a modern soldier, and the leaf-mimic katydid's wings. A third approach, motion dazzle, confuses the observer with a conspicuous pattern, making the object visible but momentarily harder to locate, as well as making general aiming easier. The majority of camouflage methods aim for crypsis, often through a general resemblance to the background, high contrast disruptive coloration, eliminating shadow, and countershading. 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. It is possible that some plants use camouflage to evade being eaten by herbivores
.

Second World War, a variety of camouflage schemes were used for aircraft
and for ground vehicles in different theatres of war. The use of radar since the mid-20th century has largely made camouflage for fixed-wing military aircraft obsolete.

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. Camouflage themes recur in modern art, and both figuratively and literally in science fiction and works of literature.

History

Octopuses like this Octopus cyanea can change colour (and shape) for camouflage

In ancient Greece,

Historia animalium:[1]

The octopus ... seeks its prey by so changing its colour as to render it like the colour of the stones adjacent to it; it does so also when alarmed.

— Aristotle[1]

Camouflage has been a topic of interest and research in

Origin of Species, Darwin wrote:[3]

When we see leaf-eating insects green, and bark-feeders mottled-grey; the alpine ptarmigan white in winter, the

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.[3]

swallowtailed moth pupae with camouflage they acquired as larvae

The English zoologist

pelagic fish it is common to find the upper surface dark-coloured and the lower surface white, so that the animal is inconspicuous when seen either from above or below."[10]

peacock
as if it were camouflaged.

The artist Abbott Handerson Thayer formulated what is sometimes called Thayer's Law, the principle of countershading.[11] However, he overstated the case in the 1909 book Concealing-Coloration in the Animal Kingdom, arguing that "All patterns and colors whatsoever of all animals that ever preyed or are preyed on are under certain normal circumstances obliterative" (that is, cryptic camouflage), and that "Not one 'mimicry' mark, not one 'warning color'... nor any 'sexually selected' color, exists anywhere in the world where there is not every reason to believe it the very best conceivable device for the concealment of its wearer",[12][13] and using paintings such as Peacock in the Woods (1907) to reinforce his argument.[14] Thayer was roundly mocked for these views by critics including Teddy Roosevelt.[15]

The English zoologist

disruptive camouflage worked, using streaks of boldly contrasting colour, paradoxically making objects less visible by breaking up their outlines.[17] While Cott was more systematic and balanced in his view than Thayer, and did include some experimental evidence on the effectiveness of camouflage,[18] his 500-page textbook was, like Thayer's, mainly a natural history narrative which illustrated theories with examples.[19]

Experimental evidence that camouflage helps prey avoid being detected by

coursers) were shown to survive according to how well their egg contrast matched the local environment.[20]

Evolution

As there is a lack of evidence for camouflage in the fossil record, studying the evolution of camouflage strategies is very difficult. Furthermore, camouflage traits must be both adaptable (provide a fitness gain in a given environment) and heritable (in other words, the trait must undergo positive selection).[21] Thus, studying the evolution of camouflage strategies requires an understanding of the genetic components and various ecological pressures that drive crypsis.

Fossil history

Camouflage is a soft-tissue feature that is rarely preserved in the

leatherback turtles and mosasaurs had dark backs and light bellies.[22] There is fossil evidence of camouflaged insects going back over 100 million years, for example lacewings larvae that stick debris all over their bodies much as their modern descendants do, hiding them from their prey.[23] Dinosaurs appear to have been camouflaged, as a 120 million year old fossil of a Psittacosaurus has been preserved with countershading.[24]

Genetics

Camouflage does not have a single genetic origin. However, studying the genetic components of camouflage in specific organisms illuminates the various ways that crypsis can evolve among lineages.

Many cephalopods have the ability to actively camouflage themselves, controlling crypsis through neural activity. For example, the genome of the common cuttlefish includes 16 copies of the reflectin gene, which grants the organism remarkable control over coloration and iridescence.[25] The reflectin gene is thought to have originated through transposition from symbiotic Aliivibrio fischeri bacteria, which provide bioluminescence to its hosts. While not all cephalopods use active camouflage, ancient cephalopods may have inherited the gene horizontally from symbiotic A. fischeri, with divergence occurred through subsequent gene duplication (such as in the case of Sepia officinalis) or gene loss (as with cephalopods with no active camouflage capabilities).[26][3] This is unique as an instance of camouflage arising as an instance of horizontal gene transfer from an endosymbiont. However, other methods of horizontal gene transfer are common in the evolution of camouflage strategies in other lineages. Peppered moths and walking stick insects both have camouflage-related genes that stem from transposition events.[27][28]

The Agouti genes are orthologous genes involved in camouflage across many lineages. They produce yellow and red coloration (phaeomelanin), and work in competition with other genes that produce black (melanin) and brown (eumelanin) colours.[29] In eastern deer mice, over a period of about 8000 years the single agouti gene developed 9 mutations that each made expression of yellow fur stronger under natural selection, and largely eliminated melanin-coding black fur coloration.[30] On the other hand, all black domesticated cats have deletions of the agouti gene that prevent its expression, meaning no yellow or red color is produced. The evolution, history and widespread scope of the agouti gene shows that different organisms often rely on orthologous or even identical genes to develop a variety of camouflage strategies.[31]

Ecology

While camouflage can increase an organism's fitness, it has genetic and energetic costs. There is a trade-off between detectability and mobility. Species camouflaged to fit a specific microhabitat are less likely to be detected when in that microhabitat, but must spend energy to reach, and sometimes to remain in, such areas. Outside the microhabitat, the organism has a higher chance of detection. Generalized camouflage allows species to avoid predation over a wide range of habitat backgrounds, but is less effective. The development of generalized or specialized camouflage strategies is highly dependent on the biotic and abiotic composition of the surrounding environment.[32]

There are many examples of the tradeoffs between specific and general cryptic patterning. Phestilla melanocrachia, a species of nudibranch that feeds on stony coral, utilizes specific cryptic patterning in reef ecosystems. The nudibranch syphons pigments from the consumed coral into the epidermis, adopting the same shade as the consumed coral. This allows the nudibranch to change colour (mostly between black and orange) depending on the coral system that it inhabits. However, P. melanocrachia can only feed and lay eggs on the branches of host-coral, Platygyra carnosa, which limits the geographical range and efficacy in nudibranch nutritional crypsis. Furthermore, the nudibranch colour change is not immediate, and switching between coral hosts when in search for new food or shelter can be costly.[33]

The costs associated with distractive or disruptive crypsis are more complex than the costs associated with background matching. Disruptive patterns distort the body outline, making it harder to precisely identify and locate.[34] However, disruptive patterns result in higher predation.[35] Disruptive patterns that specifically involve visible symmetry (such as in some butterflies) reduce survivability and increase predation.[36] Some researchers argue that because wing-shape and color pattern are genetically linked, it is genetically costly to develop asymmetric wing colorations that would enhance the efficacy of disruptive cryptic patterning. Symmetry does not carry a high survival cost for butterflies and moths that their predators views from above on a homogeneous background, such as the bark of a tree. On the other hand, natural selection drives species with variable backgrounds and habitats to move symmetrical patterns away from the centre of the wing and body, disrupting their predators' symmetry recognition.[37]

Principles

Further information: List of camouflage methods
photo of a Draco dussumieri on a tree trunk, very hard to see
Draco dussumieri uses several methods of camouflage, including disruptive coloration, lying flat, and concealment of shadow.
Papuan frogmouth resembles a broken branch.

Camouflage can be achieved by different methods, described below. Most of the methods help to hide against a background; but mimesis and motion dazzle protect without hiding. Methods may be applied on their own or in combination. Many mechanisms are visual, but some research has explored the use of techniques against

olfactory (scent) and acoustic (sound) detection.[38][39] Methods may also apply to military equipment.[40]

Background matching

Some animals' colours and patterns match a particular natural background. This is an important component of camouflage in all environments. For instance, tree-dwelling

peppered moth which has coloration that blends in with tree bark.[46] The coloration of these insects evolved between 1860 and 1940 to match the changing colour of the tree trunks on which they rest, from pale and mottled to almost black in polluted areas.[45][c] This is taken by zoologists as evidence that camouflage is influenced by natural selection, as well as demonstrating that it changes where necessary to resemble the local background.[45]

  • Lion in Kruger National Park, South Africa, blending in with the tall grass
    Lion in Kruger National Park, South Africa, blending in with the tall grass
  • Black-faced sandgrouse is coloured like its desert background.
    Black-faced sandgrouse
    is coloured like its desert background.
  • Egyptian nightjar nests in open sand with only its camouflaged plumage to protect it.
    Egyptian nightjar nests in open sand with only its camouflaged plumage to protect it.
  • Bright green katydid has the colour of fresh vegetation.
    Bright green
    katydid
    has the colour of fresh vegetation.

Disruptive coloration

Main article: disruptive coloration
Hugh Cott
, 1940

Disruptive patterns use strongly contrasting, non-repeating markings such as spots or stripes to break up the outlines of an animal or military vehicle,[47] or to conceal telltale features, especially by masking the eyes, as in the common frog.[48] Disruptive patterns may use more than one method to defeat visual systems such as edge detection.[49] Predators like the leopard use disruptive camouflage to help them approach prey, while potential prey use it to avoid detection by predators.[50] Disruptive patterning is common in military usage, both for uniforms and for military vehicles. Disruptive patterning, however, does not always achieve crypsis on its own, as an animal or a military target may be given away by factors like shape, shine, and shadow.[51][52][53]

The presence of bold skin markings does not in itself prove that an animal relies on camouflage, as that depends on its behaviour.[54] For example, although giraffes have a high contrast pattern that could be disruptive coloration, the adults are very conspicuous when in the open. Some authors have argued that adult giraffes are cryptic, since when standing among trees and bushes they are hard to see at even a few metres' distance.[55] However, adult giraffes move about to gain the best view of an approaching predator, relying on their size and ability to defend themselves, even from lions, rather than on camouflage.[55] A different explanation is implied by young giraffes being far more vulnerable to predation than adults. More than half of all giraffe calves die within a year,[55] and giraffe mothers hide their newly born calves, which spend much of the time lying down in cover while their mothers are away feeding. The mothers return once a day to feed their calves with milk. Since the presence of a mother nearby does not affect survival, it is argued that these juvenile giraffes must be very well camouflaged; this is supported by coat markings being strongly inherited.[55]

The possibility of camouflage in plants has been little studied until the late 20th century. Leaf variegation with white spots may serve as camouflage in forest understory plants, where there is a dappled background; leaf mottling is correlated with closed habitats. Disruptive camouflage would have a clear evolutionary advantage in plants: they would tend to escape from being eaten by herbivores. Another possibility is that some plants have leaves differently coloured on upper and lower surfaces or on parts such as veins and stalks to make green-camouflaged insects conspicuous, and thus benefit the plants by favouring the removal of herbivores by carnivores. These hypotheses are testable.[56][57][58]

  • Leopard: a disruptively camouflaged predator
    Leopard: a disruptively camouflaged predator
  • Russian T-90 battle tank painted in bold disruptive pattern of sand and green
    Russian T-90 battle tank painted in bold disruptive pattern of sand and green
  • Gaboon viper's bold markings are powerfully disruptive.
    Gaboon viper's bold markings are powerfully disruptive.
  • A ptarmigan and five chicks exhibit exceptional disruptive camouflage
    A
    ptarmigan
    and five chicks exhibit exceptional disruptive camouflage
  • Jumping spider: a disruptively camouflaged invertebrate predator
    Jumping spider: a disruptively camouflaged invertebrate predator
  • Many understory plants such as the saw greenbriar, Smilax bona-nox have pale markings, possibly disruptive camouflage.
    Many understory plants such as the saw greenbriar, Smilax bona-nox have pale markings, possibly disruptive camouflage.

Eliminating shadow

Camouflaged animals and vehicles are readily given away by their shapes and shadows. A flange helps to hide the shadow and a pale fringe breaks up and averages out any shadow that remains.

Some animals, such as the

Second World War.[61]

  • Three countershaded and cryptically coloured ibex almost invisible in the Israeli desert
    Three countershaded and cryptically coloured ibex almost invisible in the Israeli desert
  • "Shape, shine, shadow" make these 'camouflaged' military vehicles easily visible.
    "Shape, shine, shadow" make these 'camouflaged' military vehicles easily visible.
  • The flat-tail horned lizard's body is flattened and fringed to minimise its shadow.
    The flat-tail horned lizard's body is flattened and fringed to minimise its shadow.
  • Camouflage netting is draped away from a military vehicle to reduce its shadow.
    Camouflage netting is draped away from a military vehicle to reduce its shadow.
  • A caterpillar's fringe of bristles conceals its shadow.
    A caterpillar's fringe of bristles conceals its shadow.

Distraction

Main article: Distractive markings

Many prey animals have conspicuous high-contrast markings which paradoxically attract the predator's gaze.

blue tits increased when artificial prey had distractive markings.[63]

Self-decoration

Main article:
Self-decoration

Some animals actively seek to hide by decorating themselves with materials such as twigs, sand, or pieces of shell from their environment, to break up their outlines, to conceal the features of their bodies, and to match their backgrounds. For example, a caddisfly larva builds a decorated case and lives almost entirely inside it; a decorator crab covers its back with seaweed, sponges, and stones.[64] The nymph of the predatory masked bug uses its hind legs and a 'tarsal fan' to decorate its body with sand or dust. There are two layers of bristles (trichomes) over the body. On these, the nymph spreads an inner layer of fine particles and an outer layer of coarser particles. The camouflage may conceal the bug from both predators and prey.[65][66]

Similar principles can be applied for military purposes, for instance when a sniper wears a ghillie suit designed to be further camouflaged by decoration with materials such as tufts of grass from the sniper's immediate environment. Such suits were used as early as 1916, the British army having adopted "coats of motley hue and stripes of paint" for snipers.[67] Cott takes the example of the larva of the blotched emerald moth, which fixes a screen of fragments of leaves to its specially hooked bristles, to argue that military camouflage uses the same method, pointing out that the "device is ... essentially the same as one widely practised during the Great War for the concealment, not of caterpillars, but of caterpillar-tractors, [gun] battery positions, observation posts and so forth."[68][69]

  • This decorator crab has covered its body with sponges.
    This decorator crab has covered its body with sponges.
  • Sniper in a Ghillie suit with plant materials
    Sniper in a Ghillie suit with plant materials
  • Reduvius personatus, masked hunter bug nymph, camouflaged with sand grains
    Reduvius personatus, masked hunter bug nymph, camouflaged with sand grains
  • Soviet tanks under netting dressed with vegetation, 1938
    Soviet tanks under netting dressed with vegetation, 1938

Cryptic behaviour

leafy sea dragon
sways like seaweeds to reinforce its camouflage.

Movement catches the eye of prey animals on the lookout for predators, and of predators hunting for prey.

leafy sea dragon sways mimetically, like the seaweeds amongst which it rests, as if rippled by wind or water currents.[72] Swaying is seen also in some insects, like Macleay's spectre stick insect, Extatosoma tiaratum. The behaviour may be motion crypsis, preventing detection, or motion masquerade, promoting misclassification (as something other than prey), or a combination of the two.[73]

Motion camouflage

Main article: Motion camouflage
Comparison of motion camouflage and classical pursuit

Most forms of camouflage are ineffective when the camouflaged animal or object moves, because the motion is easily seen by the observing predator, prey or enemy.[74] However, insects such as hoverflies[75] and dragonflies use motion camouflage: the hoverflies to approach possible mates, and the dragonflies to approach rivals when defending territories.[76][77] Motion camouflage is achieved by moving so as to stay on a straight line between the target and a fixed point in the landscape; the pursuer thus appears not to move, but only to loom larger in the target's field of vision.[78] Some insects sway while moving to appear to be blown back and forth by the breeze.

The same method can be used for military purposes, for example by missiles to minimise their risk of detection by an enemy.[75] However, missile engineers, and animals such as bats, use the method mainly for its efficiency rather than camouflage.[79]

  • Male Syritta pipiens hoverflies use motion camouflage to approach females
    Male Syritta pipiens hoverflies use motion camouflage to approach females
  • Male Australian Emperor dragonflies use motion camouflage to approach rivals.
    Male
    Australian Emperor
    dragonflies use motion camouflage to approach rivals.
  • Preying mantises exhibiting motion camouflage.

Changeable skin coloration

Further information: Active camouflage and Snow camouflage

Animals such as chameleon, frog,[80] flatfish such as the peacock flounder, squid, octopus and even the isopod idotea balthica actively change their skin patterns and colours using special chromatophore cells to resemble their current background, or, as in most chameleons, for signalling.[81] However, Smith's dwarf chameleon does use active colour change for camouflage.[82]

Four frames of the same peacock flounder taken a few minutes apart, showing its ability to match its coloration to the environment
Fish and frog melanophore cells change colour by moving pigment-containing bodies.

Each chromatophore contains pigment of only one colour. In fish and frogs, colour change is mediated by a type of chromatophore known as

melanophores that contain dark pigment. A melanophore is star-shaped; it contains many small pigmented organelles which can be dispersed throughout the cell, or aggregated near its centre. When the pigmented organelles are dispersed, the cell makes a patch of the animal's skin appear dark; when they are aggregated, most of the cell, and the animal's skin, appears light. In frogs, the change is controlled relatively slowly, mainly by hormones. In fish, the change is controlled by the brain, which sends signals directly to the chromatophores, as well as producing hormones.[83]

The skins of cephalopods such as the octopus contain complex units, each consisting of a chromatophore with surrounding muscle and nerve cells.[84] The cephalopod chromatophore has all its pigment grains in a small elastic sac, which can be stretched or allowed to relax under the control of the brain to vary its opacity. By controlling chromatophores of different colours, cephalopods can rapidly change their skin patterns and colours.[85][86]

On a longer timescale, animals like the Arctic hare, Arctic fox, stoat, and rock ptarmigan have snow camouflage, changing their coat colour (by moulting and growing new fur or feathers) from brown or grey in the summer to white in the winter; the Arctic fox is the only species in the dog family to do so.[87] However, Arctic hares which live in the far north of Canada, where summer is very short, remain white year-round.[87][88]

The principle of varying coloration either rapidly or with the changing seasons has military applications.

Peltier plate panels are heated and cooled to match either the vehicle's surroundings (crypsis), or an object such as a car (mimesis), when viewed in infrared.[89][90][91]

  • Rock ptarmigan, changing colour in springtime. The male is still mostly in winter plumage
    Rock ptarmigan, changing colour in springtime. The male is still mostly in winter plumage
  • Norwegian volunteer soldiers in Winter War, 1940, with white camouflage overalls over their uniforms
    Norwegian volunteer soldiers in Winter War, 1940, with white camouflage overalls over their uniforms
  • Arctic hares in the low arctic change from brown to white in winter
    Arctic hares in the low arctic change from brown to white in winter
  • Snow-camouflaged German Marder III jagdpanzer and white-overalled crew and infantry in Russia, 1943
    Snow-camouflaged German Marder III jagdpanzer and white-overalled crew and infantry in Russia, 1943
  • Veiled chameleon, Chamaeleo calyptratus, changes colour mainly in relation to mood and for signalling.
    Veiled chameleon, Chamaeleo calyptratus, changes colour mainly in relation to mood and for signalling.
  • Adaptiv infrared camouflage lets an armoured vehicle mimic a car.
    Adaptiv infrared camouflage lets an armoured vehicle mimic a car.

Countershading

Main article: Countershading
Countershading acts as a form of camouflage by 'painting out' the self-shadowing of the body or object. The result is a 'flat' appearance, instead of the 'solid' appearance of the body before countershading.

Countershading uses graded colour to counteract the effect of self-shadowing, creating an illusion of flatness. Self-shadowing makes an animal appear darker below than on top, grading from light to dark; countershading 'paints in' tones which are darkest on top, lightest below, making the countershaded animal nearly invisible against a suitable background.

dolphins;[95] and birds, such as snipe and dunlin.[96][97]

Countershading is less often used for military camouflage, despite Second World War experiments that showed its effectiveness. English

Hugh Cott encouraged the use of methods including countershading, but despite his authority on the subject, failed to persuade the British authorities.[98] Soldiers often wrongly viewed camouflage netting as a kind of invisibility cloak, and they had to be taught to look at camouflage practically, from an enemy observer's viewpoint.[99][100] At the same time in Australia, zoologist William John Dakin advised soldiers to copy animals' methods, using their instincts for wartime camouflage.[101]

The term countershading has a second meaning unrelated to "Thayer's Law". It is that the upper and undersides of animals such as sharks, and of some military aircraft, are different colours to match the different backgrounds when seen from above or from below. Here the camouflage consists of two surfaces, each with the simple function of providing concealment against a specific background, such as a bright water surface or the sky. The body of a shark or the fuselage of an aircraft is not gradated from light to dark to appear flat when seen from the side. The camouflage methods used are the matching of background colour and pattern, and disruption of outlines.[94]

  • Countershaded Dorcas gazelle, Gazella dorcas
    Countershaded Dorcas gazelle, Gazella dorcas
  • Countershaded grey reef shark, Carcharhinus amblyrhynchos
    Countershaded grey reef shark, Carcharhinus amblyrhynchos
  • Countershaded ship and submarine in Thayer's 1902 patent application
    Countershaded ship and submarine in Thayer's 1902 patent application
  • Two model birds painted by Thayer: painted in background colours on the left, countershaded and nearly invisible on the right
    Two model birds painted by Thayer: painted in background colours on the left, countershaded and nearly invisible on the right
  • Countershaded Focke-Wulf Fw 190D-9
    Countershaded
    Focke-Wulf Fw 190D-9

Counter-illumination

Main article: Counter-illumination
firefly squid

Counter-illumination means producing light to match a background that is brighter than an animal's body or military vehicle; it is a form of active camouflage. It is notably used by some species of

photophores) scattered all over its underside; these create a sparkling glow that prevents the animal from appearing as a dark shape when seen from below.[102] Counterillumination camouflage is the likely function of the bioluminescence of many marine organisms, though light is also produced to attract[103] or to detect prey[104]
and for signalling.

Counterillumination has rarely been used for military purposes. "

National Research Council during the Second World War. It involved projecting light on to the sides of ships to match the faint glow of the night sky, requiring awkward external platforms to support the lamps.[105] The Canadian concept was refined in the American Yehudi lights project, and trialled in aircraft including B-24 Liberators and naval Avengers.[106] The planes were fitted with forward-pointing lamps automatically adjusted to match the brightness of the night sky.[105] This enabled them to approach much closer to a target – within 3,000 yards (2,700 m) – before being seen.[106] Counterillumination was made obsolete by radar, and neither diffused lighting camouflage nor Yehudi lights entered active service.[105]

  • HMS Largs by night with incomplete diffused lighting camouflage, 1942, set to maximum brightness
    HMS Largs by night with incomplete diffused lighting camouflage, 1942, set to maximum brightness
  • Bulwark of HMS Largs showing 4 (of about 60) diffused lighting fittings, 2 lifted, 2 deployed
    Bulwark of HMS Largs showing 4 (of about 60) diffused lighting fittings, 2 lifted, 2 deployed
  • Yehudi Lights raise the average brightness of the plane from a dark shape to the same as the sky.
    Yehudi Lights
    raise the average brightness of the plane from a dark shape to the same as the sky.

Transparency

Further information: Underwater camouflage
Many animals of the open sea, like this Aurelia labiata jellyfish, are largely transparent.

Many marine animals that float near the surface are highly transparent, giving them almost perfect camouflage.[107] However, transparency is difficult for bodies made of materials that have different refractive indices from seawater. Some marine animals such as jellyfish have gelatinous bodies, composed mainly of water; their thick mesogloea is acellular and highly transparent. This conveniently makes them buoyant, but it also makes them large for their muscle mass, so they cannot swim fast, making this form of camouflage a costly trade-off with mobility.[107] Gelatinous planktonic animals are between 50 and 90 percent transparent. A transparency of 50 percent is enough to make an animal invisible to a predator such as cod at a depth of 650 metres (2,130 ft); better transparency is required for invisibility in shallower water, where the light is brighter and predators can see better. For example, a cod can see prey that are 98 percent transparent in optimal lighting in shallow water. Therefore, sufficient transparency for camouflage is more easily achieved in deeper waters.[107]

Hyalinobatrachium uranoscopum
 use partial transparency for camouflage in the dim light of the rainforest.

Some tissues such as

Amazon river fish Microphilypnus amazonicus and the shrimps it associates with, Pseudopalaemon gouldingi, are so transparent as to be "almost invisible"; further, these species appear to select whether to be transparent or more conventionally mottled (disruptively patterned) according to the local background in the environment.[109]

Silvering

Clupea harengus
, is a typical silvered fish of medium depths, camouflaged by reflection.
The herring's reflectors are nearly vertical for camouflage from the side.

Where transparency cannot be achieved, it can be imitated effectively by silvering to make an animal's body highly reflective. At medium depths at sea, light comes from above, so a mirror oriented vertically makes animals such as fish invisible from the side. Most fish in the upper ocean such as sardine and herring are camouflaged by silvering.[110]

The marine hatchetfish is extremely flattened laterally, leaving the body just millimetres thick, and the body is so silvery as to resemble aluminium foil. The mirrors consist of microscopic structures similar to those used to provide structural coloration: stacks of between 5 and 10 crystals of guanine spaced about 1⁄4 of a wavelength apart to interfere constructively and achieve nearly 100 per cent reflection. In the deep waters that the hatchetfish lives in, only blue light with a wavelength of 500 nanometres percolates down and needs to be reflected, so mirrors 125 nanometres apart provide good camouflage.[110]

In fish such as the herring which live in shallower water, the mirrors must reflect a mixture of wavelengths, and the fish accordingly has crystal stacks with a range of different spacings. A further complication for fish with bodies that are rounded in cross-section is that the mirrors would be ineffective if laid flat on the skin, as they would fail to reflect horizontally. The overall mirror effect is achieved with many small reflectors, all oriented vertically.

cephalopods, including squid, octopus and cuttlefish, have multilayer mirrors made of protein rather than guanine.[110]

Ultra-blackness

Further information: Underwater camouflage
Blackdevil anglerfish is one of several deep-sea fishes camouflaged against very dark water with a black dermis.

Some deep sea fishes have very black skin, reflecting under 0.5% of ambient light. This can prevent detection by predators or prey fish which use bioluminescence for illumination. Oneirodes had a particularly black skin which reflected only 0.044% of 480 nm wavelength light. The ultra-blackness is achieved with a thin but continuous layer of particles in the dermis, melanosomes. These particles both absorb most of the light, and are sized and shaped so as to scatter rather than reflect most of the rest. Modelling suggests that this camouflage should reduce the distance at which such a fish can be seen by a factor of 6 compared to a fish with a nominal 2% reflectance. Species with this adaptation are widely dispersed in various orders of the phylogenetic tree of bony fishes (Actinopterygii), implying that natural selection has driven the convergent evolution of ultra-blackness camouflage independently many times.[111]

Mimesis

Further information:
Cryptic aggressive mimicry

In

prey animals, for example when a peppered moth caterpillar mimics a twig, or a grasshopper mimics a dry leaf.[113] It is also found in nest structures; some eusocial wasps, such as Leipomeles dorsata, build a nest envelope in patterns that mimic the leaves surrounding the nest.[114]

Mimesis is also employed by some

parasites to lure their prey. For example, a flower mantis mimics a particular kind of flower, such as an orchid.[115] This tactic has occasionally been used in warfare, for example with heavily armed Q-ships disguised as merchant ships.[116][117][118]

The

brood parasite, provides examples of mimesis both in the adult and in the egg. The female lays her eggs in nests of other, smaller species of bird, one per nest. The female mimics a sparrowhawk. The resemblance is sufficient to make small birds take action to avoid the apparent predator. The female cuckoo then has time to lay her egg in their nest without being seen to do so.[119] The cuckoo's egg itself mimics the eggs of the host species, reducing its chance of being rejected.[120][121]

  • Peppered moth caterpillars mimic twigs
    Peppered moth caterpillars mimic twigs
  • Flower mantis lures its insect prey by mimicking a Phalaenopsis orchid blossom
    Flower mantis lures its insect prey by mimicking a Phalaenopsis orchid blossom
  • Hooded grasshopper Teratodus monticollis, superbly mimics a leaf with a bright orange border
    Hooded grasshopper Teratodus monticollis, superbly mimics a leaf with a bright orange border
  • This grasshopper hides from predators by mimicking a dry leaf
    This grasshopper hides from predators by mimicking a dry leaf
  • WWII tank concealed in Operation Bertram by mimicking a truck
    WWII tank concealed in Operation Bertram by mimicking a truck
  • Armed WW1 Q-ship lured enemy submarines by mimicking a merchantman
    Armed WW1 Q-ship lured enemy submarines by mimicking a merchantman
  • Cuckoo adult mimics sparrowhawk, giving female time to lay eggs parasitically
    Cuckoo adult mimics sparrowhawk, giving female time to lay eggs parasitically
  • Cuckoo eggs mimicking smaller eggs, in this case of reed warbler
    Cuckoo eggs mimicking smaller eggs, in this case of
    reed warbler
  • Wrap-around spider Dolophones mimicking a stick
    Wrap-around spider Dolophones mimicking a stick

Motion dazzle

Not to be confused with dazzle camouflage.
The zebra's bold pattern may induce motion dazzle in observers

Most forms of camouflage are made ineffective by movement: a deer or grasshopper may be highly cryptic when motionless, but instantly seen when it moves. But one method, motion dazzle, requires rapidly moving bold patterns of contrasting stripes.[122] Motion dazzle may degrade predators' ability to estimate the prey's speed and direction accurately, giving the prey an improved chance of escape.[123] Motion dazzle distorts speed perception and is most effective at high speeds; stripes can also distort perception of size (and so, perceived range to the target). As of 2011, motion dazzle had been proposed for military vehicles, but never applied.[122] Since motion dazzle patterns would make animals more difficult to locate accurately when moving, but easier to see when stationary, there would be an evolutionary trade-off between motion dazzle and crypsis.[123]

An animal that is commonly thought to be dazzle-patterned is the

visual illusions: the wagon-wheel effect, where the perceived motion is inverted, and the barberpole illusion, where the perceived motion is in a wrong direction.[129]

Applications

Military

Main articles: Military camouflage and List of military clothing camouflage patterns

Before 1800

Roman ships, depicted on a 3rd-century AD sarcophagus

Ship camouflage was occasionally used in ancient times.

Mochica culture from before 500 AD, hunting birds with blowpipes which are fitted with a kind of shield near the mouth, perhaps to conceal the hunters' hands and faces.[132] Another early source is a 15th-century French manuscript, The Hunting Book of Gaston Phebus, showing a horse pulling a cart which contains a hunter armed with a crossbow under a cover of branches, perhaps serving as a hide for shooting game.[133] Jamaican Maroons are said to have used plant materials as camouflage in the First Maroon War (c. 1655–1740).[134]

19th-century origins

Green-jacketed rifleman firing Baker rifle
1803

The development of military camouflage was driven by the increasing range and accuracy of infantry firearms in the 19th century. In particular the replacement of the inaccurate

rifle green jacket, while the Line regiments continued to wear scarlet tunics.[135] A contemporary study in 1800 by the English artist and soldier Charles Hamilton Smith provided evidence that grey uniforms were less visible than green ones at a range of 150 yards.[136]

In the

Corps of Guides at Peshawar, when Sir Harry Lumsden and his second in command, William Hodson introduced a "drab" uniform in 1848.[138] Hodson wrote that it would be more appropriate for the hot climate, and help make his troops "invisible in a land of dust".[139] Later they improvised by dyeing cloth locally. Other regiments in India soon adopted the khaki uniform, and by 1896 khaki drill uniform was used everywhere outside Europe;[140] by the Second Boer War six years later it was used throughout the British Army.[141]

During the late 19th century camouflage was applied to British coastal fortifications.[142] The fortifications around Plymouth, England were painted in the late 1880s in "irregular patches of red, brown, yellow and green."[143] From 1891 onwards British coastal artillery was permitted to be painted in suitable colours "to harmonise with the surroundings"[144] and by 1904 it was standard practice that artillery and mountings should be painted with "large irregular patches of different colours selected to suit local conditions."[145]

First World War

Further information: list of camoufleurs
Iron observation post camouflaged as a tree by Cubist painter André Mare, 1916

In the

First World War, the French army formed a camouflage corps, led by Lucien-Victor Guirand de Scévola,[146][147] employing artists known as camoufleurs to create schemes such as tree observation posts and covers for guns. Other armies soon followed them.[148][149][150] The term camouflage probably comes from camoufler, a Parisian slang term meaning to disguise, and may have been influenced by camouflet, a French term meaning smoke blown in someone's face.[151][152] The English zoologist John Graham Kerr, artist Solomon J. Solomon and the American artist Abbott Thayer led attempts to introduce scientific principles of countershading and disruptive patterning into military camouflage, with limited success.[153][154] In early 1916 the Royal Naval Air Service began to create dummy air fields to draw the attention of enemy planes to empty land. They created decoy homes and lined fake runways with flares, which were meant to help protect real towns from night raids. This strategy was not common practice and did not succeed at first, but in 1918 it caught the Germans off guard multiple times.[155]

U-boats were sinking many British ships with torpedoes, the marine artist Norman Wilkinson devised dazzle camouflage, which paradoxically made ships more visible but harder to target.[158] In Wilkinson's own words, dazzle was designed "not for low visibility, but in such a way as to break up her form and thus confuse a submarine officer as to the course on which she was heading".[159]

  • USS West Mahomet in dazzle camouflage
    USS West Mahomet in dazzle camouflage
  • Siege howitzer camouflaged against observation from the air, 1917
    Siege howitzer camouflaged against observation from the air, 1917
  • Austro-Hungarian ski patrol in two-part snow uniforms with improvised head camouflage on Italian front, 1915–1918
    Austro-Hungarian ski patrol in two-part snow uniforms with improvised head camouflage on Italian front, 1915–1918

Second World War

Further information: list of camoufleurs, World War II ship camouflage measures of the United States Navy, and German World War II camouflage patterns

In the

protégé of Kerr, worked to persuade the British army to use more effective camouflage methods, including countershading, but, like Kerr and Thayer in the First World War, with limited success. For example, he painted two rail-mounted coastal guns, one in conventional style, one countershaded. In aerial photographs, the countershaded gun was essentially invisible.[160] The power of aerial observation and attack led every warring nation to camouflage targets of all types. The Soviet Union's Red Army created the comprehensive doctrine of Maskirovka for military deception, including the use of camouflage.[161] For example, during the Battle of Kursk, General Katukov, the commander of the Soviet 1st Tank Army, remarked that the enemy "did not suspect that our well-camouflaged tanks were waiting for him. As we later learned from prisoners, we had managed to move our tanks forward unnoticed". The tanks were concealed in previously prepared defensive emplacements, with only their turrets above ground level.[162] In the air, Second World War fighters were often painted in ground colours above and sky colours below, attempting two different camouflage schemes for observers above and below.[163] Bombers and night fighters were often black,[164] while maritime reconnaissance planes were usually white, to avoid appearing as dark shapes against the sky.[165] For ships, dazzle camouflage was mainly replaced with plain grey in the Second World War, though experimentation with colour schemes continued.[156]

As in the First World War, artists were pressed into service; for example, the surrealist painter

camoufleurs, included Steven Sykes and Tony Ayrton.[168][169] In Australia, artists were also prominent in the Sydney Camouflage Group, formed under the chairmanship of Professor William John Dakin, a zoologist from Sydney University. Max Dupain, Sydney Ure Smith, and William Dobell were among the members of the group, which worked at Bankstown Airport, RAAF Base Richmond and Garden Island Dockyard.[170] In the United States, artists like John Vassos took a certificate course in military and industrial camouflage at the American School of Design with Baron Nicholas Cerkasoff, and went on to create camouflage for the Air Force.[171]

After 1945

Further information:
List of camouflage patterns

Camouflage has been used to protect military equipment such as vehicles, guns, ships,[156] aircraft and buildings[172] as well as individual soldiers and their positions.[173] Vehicle camouflage methods begin with paint, which offers at best only limited effectiveness. Other methods for stationary land vehicles include covering with improvised materials such as blankets and vegetation, and erecting nets, screens and soft covers which may suitably reflect, scatter or absorb

night vision devices.[177]
After the Second World War, radar made camouflage generally less effective, though coastal boats are sometimes painted like land vehicles.[156] Aircraft camouflage too came to be seen as less important because of radar, and aircraft of different air forces, such as the Royal Air Force's Lightning, were often uncamouflaged.[178]

Many

combat clothing to different kinds of terrain (such as woodland, snow, and desert).[179] The design of a pattern effective in all terrains has proved elusive.[180][181][182] The American Universal Camouflage Pattern of 2004 attempted to suit all environments, but was withdrawn after a few years of service.[183] Terrain-specific patterns have sometimes been developed but are ineffective in other terrains.[184] The problem of making a pattern that works at different ranges has been solved with multiscale designs, often with a pixellated appearance and designed digitally, that provide a fractal-like range of patch sizes so they appear disruptively coloured both at close range and at a distance.[185] The first genuinely digital camouflage pattern was the Canadian Disruptive Pattern (CADPAT), issued to the army in 2002, soon followed by the American Marine pattern (MARPAT). A pixellated appearance is not essential for this effect, though it is simpler to design and to print.[186]

  • CADPAT was the first pixellated digital camouflage pattern to be issued, in 2002.
    digital camouflage
    pattern to be issued, in 2002.
  • British Disruptive Pattern Material, issued to special forces in 1963 and universally by 1968
    British Disruptive Pattern Material, issued to special forces in 1963 and universally by 1968
  • 2007 2-colour snow variant of Finnish Defence Forces M05 pattern
    2007 2-colour snow variant of Finnish Defence Forces M05 pattern
  • Main (4-colour woodland) variant of Chinese People's Liberation Army Type 99 pattern, c. 2006
    Main (4-colour woodland) variant of Chinese
    Type 99
    pattern, c. 2006
  • Modern German Flecktarn 1990, developed from a 1938 pattern, a non-digital pattern which works at different distances
    Modern German Flecktarn 1990, developed from a 1938 pattern, a non-digital pattern which works at different distances
  • US "Chocolate Chip" Six-Color Desert Pattern developed in 1962, widely used in Gulf War
    US "Chocolate Chip"
    Six-Color Desert Pattern developed in 1962, widely used in Gulf War

Hunting

A hide used in field sports

Hunters of game have long made use of camouflage in the form of materials such as animal skins, mud, foliage, and green or brown clothing to enable them to approach wary game animals.[187] Field sports such as driven grouse shooting conceal hunters in hides (also called blinds or shooting butts).[188] Modern hunting clothing makes use of fabrics that provide a disruptive camouflage pattern; for example, in 1986 the hunter Bill Jordan created cryptic clothing for hunters, printed with images of specific kinds of vegetation such as grass and branches.[189]

Civil structures

Cellphone tower disguised as a tree

Camouflage is occasionally used to make built structures less conspicuous: for example, in South Africa, towers carrying cell telephone antennae are sometimes camouflaged as tall trees with plastic branches, in response to "resistance from the community". Since this method is costly (a figure of three times the normal cost is mentioned), alternative forms of camouflage can include using neutral colours or familiar shapes such as cylinders and flagpoles. Conspicuousness can also be reduced by siting masts near, or on, other structures.[190]

Automotive manufacturers often use patterns to disguise upcoming products. This camouflage is designed to obfuscate the vehicle's visual lines, and is used along with padding, covers, and decals. The patterns' purpose is to prevent visual observation (and to a lesser degree photography), that would subsequently enable reproduction of the vehicle's form factors.[191]

Fashion, art and society

1919 dazzle ball costumes
The "dazzle ball" held by the Chelsea Arts Club, 1919

Military camouflage patterns influenced fashion and art from the time of the First World War onwards. Gertrude Stein recalled the cubist artist Pablo Picasso's reaction in around 1915:

I very well remember at the beginning of the war being with Picasso on the boulevard Raspail when the first camouflaged truck passed. It was at night, we had heard of camouflage but we had not seen it and Picasso amazed looked at it and then cried out, yes it is we who made it, that is cubism.

— Gertrude Stein in From Picasso (1938)[192]

In 1919, the attendants of a "dazzle ball", hosted by the Chelsea Arts Club, wore dazzle-patterned black and white clothing. The ball influenced fashion and art via postcards and magazine articles.

Illustrated London News announced:[193][194]

The scheme of decoration for the great fancy dress ball given by the Chelsea Arts Club at the Albert Hall, the other day, was based on the principles of "Dazzle", the method of "camouflage" used during the war in the painting of ships ... The total effect was brilliant and fantastic.

More recently, fashion designers have often used camouflage fabric for its striking designs, its "patterned disorder" and its symbolism.

anti-war protestors often ironically wore military clothing during demonstrations against the American involvement in the Vietnam War.[196]

Modern artists such as

Et in Arcadia ego which recurs in Hamilton Finlay's work. In science fiction, Camouflage is a novel about shapeshifting alien beings by Joe Haldeman.[198] The word is used more figuratively in works of literature such as Thaisa Frank's collection of stories of love and loss, A Brief History of Camouflage.[199]

  • André Mare's Cubist sketch, c. 1917, of a 280 calibre gun illustrates the interplay of art and war, as artists like Mare contributed their skills as wartime camoufleurs.
    camoufleurs
    .
  • Camouflage clothing in an anti-war protest, 1971
    Camouflage clothing in an
    anti-war protest
    , 1971
  • A camouflage skirt as a fashion item, 2007
    A camouflage skirt as a fashion item, 2007

Notes

  1. ^ A letter from Alfred Russel Wallace to Darwin of 8 March 1868 mentioned such colour change: "Would you like to see the specimens of pupæ of butterflies whose colours have changed in accordance with the colour of the surrounding objects? They are very curious, and Mr. T. W. Wood, who bred them, would, I am sure, be delighted to bring them to show you."[5]
  2. ^ Cott explains Beddard's observation as a coincident disruptive pattern.[9]
  3. ^ Before 1860, unpolluted tree trunks were often covered in pale lichens; polluted trunks were bare, and often nearly black.
  4. ^ These distraction markings are sometimes called dazzle markings, but have nothing to do with motion dazzle or wartime dazzle painting.
  5. ^ The belly of the zebra is white, and the dark stripes narrow towards the belly, so the animal is certainly countershaded, but this does not prove that the main function of the stripes is camouflage.
  6. ^ See Ian Hamilton Finlay#Art.

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Bibliography

Camouflage in nature

Early research

General reading

Military camouflage

Further reading

For children

External links

Wikimedia Commons has media related to Camouflage.
Look up camouflage in Wiktionary, the free dictionary.
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