Proof that camouflage actually saves prey only arrived in 2016
Naturalists have praised camouflage since Aristotle watched octopuses match the stones around them. Yet the first experiment showing it truly keeps prey alive came only in 2016, from ground-nesting plovers and coursers whose eggs survived according to how well they blended with the local ground.
Camouflage hides things either by making them hard to spot or by dressing them as something else: a leopard's rosettes, a soldier's battledress, a katydid whose wings pass for leaves. Most methods aim at crypsis, using background matching, bold disruptive markings, shadow removal and countershading. In open water, with nothing to blend into, animals turn transparent, silvered or countershaded, and squid glow on their undersides to cancel their silhouettes. A third tactic, motion dazzle, makes a target easy to see but hard to pin down. Chameleons and octopuses can rewrite their colours at will.
Early theorists built the framework. Edward Poulton's 1890 book sorted types such as protective and aggressive resemblance, and his experiments showed swallow-tailed moth pupae matching the backgrounds their larvae grew up on. Frank Beddard in 1892 noted that open-sea fish like mackerel are dark above and white below. The painter Abbott Thayer formalised countershading, but his 1909 insistence that every animal colour conceals drew ridicule, and Hugh Cott's 1940 textbook corrected him, explaining how sharply contrasting streaks break up an outline.
Fossils rarely keep colour, yet some do. Cretaceous skins show mosasaurs and leatherback turtles with dark backs and pale bellies, a 120-million-year-old Psittacosaurus was countershaded, and lacewing larvae coated themselves in debris more than 100 million years ago. Genetics reveals many routes to the same end. The common cuttlefish carries 16 copies of the reflectin gene, which may have jumped from glowing symbiotic bacteria. In eastern deer mice, the agouti gene gathered nine mutations over about 8,000 years that strengthened yellow fur, while every black domestic cat carries agouti deletions.
Concealment has costs. Specialists that match one microhabitat must spend energy reaching and staying there and become conspicuous elsewhere, while generalists hide passably almost anywhere but never perfectly. Humans borrowed the tricks once rifles made concealment vital: World War I artists such as André Mare designed disguised observation posts, dazzle paint confused submarine gunners, and radar later made aircraft camouflage largely pointless.
Source: Camouflage
