Synopsis:
Cuttlefish are marine animals of the order Sepiida. They belong to the
class Cephalopoda, which also includes squid, octopuses, and nautiluses.
'Cuttle' is a reference to their unique internal shell, the cuttlebone;
and despite their name, cuttlefish are true mollusks.
Cuttlefish
have large, W-shaped pupils, eight arms, and two tentacles furnished
with denticulated suckers, with which they secure their prey. They
generally range in size from 15 to 25 cm (5.9 to 9.8 in), with the
largest species, Sepia apama, reaching 50 cm (20 in) in mantle length
and over 10.5 kg (23 lb) in weight.[1]
Camouflage is the use of
any combination of materials, coloration or illumination for
concealment, either by making animals or objects hard to see (crypsis),
or by disguising them as something else (mimesis). Examples include the
leopard's spotted coat, the battledress of a modern soldier, and the
leaf-mimic katydid's wings.[1] A third approach, motion dazzle, confuses
the observer with a conspicuous pattern, making the object visible but
momentarily harder to locate. 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; they often use this ability
both for camouflage and for signalling.
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 personal concealment in battle a survival skill. In the 20th
century, military camouflage developed rapidly, especially during the
First World War. On land, artists such as André Mare designed camouflage
schemes and observation posts disguised as trees. At sea, warships and
troop carriers were painted in dazzle patterns that were highly visible,
but designed to confuse enemy gunners as to the target's speed, range,
and heading. During and after the 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 in the Cold War period 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.
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