camouflage

definition: 
The natural colouring or form of an animal which enables it to blend in with its surroundings
sentence: 
One of the most widespread and varied adaptations is natural camouflage, an animal's ability to hide itself from predator and prey.
Some animals, such as chameleons and octopuses, are capable of actively changing their skin pattern and colours, whether for camouflage or for signalling.
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 such as squid.
difficulty: 
easy
toefl frequency: 
3
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