Suppose the Orcs are mammals, why is their skin green?

Most species of animal, especially mammals, have a special skin cell the produces melanin, which is responsible for the color of their skin, but orcs are generally depicted as green creatures and, of course they are another race too, but for this question, assume they are mammals and are green. What will be the evolutionary trait that causes it and is there any real benefit should they form civilization resembling our modern society?

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Suppose the Orcs are mammals, why is their skin green?

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