We say that the chameleon changes colour every moment. And it changes the colour of its skin so that it corresponds to the colour of the surroundings. This helps the creature to hoodwink its enemies and protect itself.
This is one of the numerous wonders of nature and creation. That is the instinct of self-preservation of life. But when it comes to the human beings, the instinct of self preservation extends beyond a limit and takes bizarre proportions.
There is a distinction between the humans and the rest of the animal world. That distinction is in the sphere of the human values, principles, ethics and morality. When man compromises on these for his narrow interests he is compared to chameleon, though it does not do justice to the chameleon. Like all comparisons, this too suffers from a limitation. But it makes us understand the phenomenon.
Many thanks to this lovely creature that makes us simplify the complexities of a "human".
All of these are clicked on my Canon EOS 1000D. (Specifications on request)