major reference

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  In coloration: Optical functions: deceptive coloration

  Deceptive coloration depends on four factors: the coloured organism, hereafter referred to as the organism; its model, which may be the background against which it is concealed; the spectral quality of the illumination; and the visual sensitivity and behaviour of the animal or…

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  In coloration: Optical functions: combination of concealing and advertising coloration

  Most animals need both concealment and advertisement. An animal may need to conceal itself from predators and to advertise its presence to symbionts or to members of its own species for reproductive purposes.

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