Mostly we found some animals & insects have an ability to change themselves the colour of their bodies with their sorrounding for example, lizards turn green color in a green surrounding. The abilities shows by these type of animals lead the ecological systematic as well as biological systems.
In persue of that reasons many living beings try to hide them self from the attacking of predators. Predators itself hide to get attacks others as their food survival.
Chameleon example has that ability to change colours with respected to the surrounding they live for. These type of animals have the super special chemicals in their skin body to absorb the colour pigments from external color of lights.
The pigment contained like guanine crystal presents inside the skin and accupied small space for changing structure to converted the color pigments from one form to another with in a minutes of time. Some of this type of animals also they have the small cells called chromatophore also help them copying the color of their parasites to avoided attacking and killing.
Aquatics bacteria used this life style copying colors below the sea. Chromatophore undergo changing color for a long period of time due to the evolutionary effects. They are settled under the bodies of host and remains the same colours like their hosts behave. Hiding themselves from killing and absorbing the food from the host as well. Protecting their body by copying parasitic colours too.
In some cases Sex and Reproduction system also plays a major role for the changing of the colour of the lizards. While a male and female copying the colour of their surrounding in order to make their senses of beauties and attraction. Females used to decorates many types of spot color, bright and beautiful. While Male are simply change as plain colours as compare to females. But still they are in the similar type of colours.
They can survived weeks after weeks at the same surrounding with the same color searching food as well as hiding from attacking of predators and introducing sex etc. In facts they are the predator to some insects too. There are many reasons which make animals to change colour from time to time because of climates conditions also evolutionary problems.
It is more we find in evolutionary conditions as per the journalist studies found that from places to places,time to time the animals used ti change their character and behaviour as well as their body skin also changes in many different forms.