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Normally the pigmentation of the chameleon skin tends to have the colors of the environment in which it lives - in a forest it will be greener, in the mountains it will have darker colors - and to change according to different conditions: the state of mind (fear, stress, aggression, well-being), to the climatic situation and those of light. The change also takes place slowly and gradually and it is not enough to put a pair of glasses near it to recreate the right stimulus and induce them to change color especially in such a sudden way.
These animals change skin thanks to some special cells, the chromatophores, which are found in the epidermis.