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Orcs have been a staple fantasy enemy race for decades, but what could cause such a species to exist in real life? What would cause them to develop green skin like they're often depicted as having? What about the tusks they often have?

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closed as too broad by dot_Sp0T, Aify, RonJohn, Mołot, Tim B II Apr 25 '18 at 9:34

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Possible duplicate of Suppose the Orcs are mammals, why is their skin green? $\endgroup$ – Aify Apr 25 '18 at 5:40
  • $\begingroup$ Two questions you might consider asking elsewhere (is there a Biology SE or Evolution SE?) is "Why have animals that are green evolved to be green" & "Why have humans never evolved to have bright colors such as blue or green like many other animals have" the answer to these questions may help you. $\endgroup$ – Pelinore Apr 25 '18 at 7:02
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    $\begingroup$ @Pelinore Biology SE is a real site. See their subject scope. They allow for "general questions about biological concepts", which presumably would include questions relating to evolution as that is widely considered a biological concept (and one of its fundamental underpinnings, at that). $\endgroup$ – a CVn Apr 25 '18 at 8:51
  • $\begingroup$ Please, don't describe it as "often have". Find out what is most iconic orc "image" and then simply describe it. Decide what properties are needed for it to be an orc and go with it. $\endgroup$ – Mołot Apr 25 '18 at 9:14
  • $\begingroup$ VTCers! The anatomically correct series of questions is one of those unique precedents on WB.SE that, for better or for worse, pretty much gets a bye in the VTC queue. If anything is lacking here, it's a clear description of what the OP believes is an orc. OP, I recommend you follow my link and look at examples of these type of questions. If you have the necessary information, your question shouldn't be closed. (Frankly, since the slender man Q wasn't closed, this one shouldn't be by definition.) $\endgroup$ – JBH Apr 25 '18 at 9:32