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I know everyone knows about the typical "grey alien" I was just wondering if a species like them really existed what type of environment would they live in? And what certain factors in their environment would lead to their existence?

I also know the depiction of the Greys varies from very short 3-4 ft and very tall 6 ft + tall. Let's just assume they are short 3-4 ft instead.

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closed as too broad by Aify, Hohmannfan, Vincent, Thucydides, bilbo_pingouin Jul 11 '16 at 7:35

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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With their enlarged heads (which implies larger brains), thinner arms and legs (implying a more mental, less physical, work load), their pale skin tones and large eyes (from controlled exposure to sunlight), the Greys could easily share our evolutionary history and count us as their uncivilized forebears.

The Greys are what we will look like once evolution has had enough time to adapt us completely to the artificial environment which we call civilization.

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    $\begingroup$ Humans born and evolved for life in zero gravity for generations. Bones elongated and thinned without the constant pull of gravity. Black eyes adapted to the constant unvarying mechanical light. $\endgroup$ – Lumberjack Jul 11 '16 at 2:35
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    $\begingroup$ Atlantean forebears sent an ark on a long journey to safe guard mankind's legacy. Only, the cataclysm that destroyed their civilisation left behind a small pocket of humanity in northern Africa. $\endgroup$ – Lumberjack Jul 11 '16 at 2:39
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    $\begingroup$ @Lumberjack. These are excellent ideas! You should make them into an answer. I've always perferred the "Aliens are from our future" trop because it doesn't require an entirely seperate life-bearing planet and evolutionary tree. Your Atlantean angle allows the Aliens to come from our past, which has all of the same attributes of my answer, plus some really cool spin-off ramifications. Post it as an answer! $\endgroup$ – Henry Taylor Jul 11 '16 at 2:50

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