The feasibility of Grey Aliens?

To clarify, grey aliens are seen to be either shorter or taller than the average humans, and sport a bulbous like head. their head has two big black eyes and have two smaller holes that are the nostrils. Lastly, the body of the aliens seem to be fairly slender, and has the common color of grey

what environmental requirements would be needed to lead to the rise of grey aliens?

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The feasibility of Grey Aliens?

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