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Yeah. It's kinda difficult to comment when we know it IS the lighting.
A white Alien wouldn't make much sense. We've seen that darkness is the Alien's friend when it comes to hunting. I'm guessing the species they've dealt with rely on the same spectrum of light that we do, so the Alien's colouring is naturally black to be able to effectively hide in darkness. Maybe their exploiting of our night blindness is inherited?
Just trying to get people to use their imaginations, that's all.
You know, it's interesting how Predators naturally operate on Infared, but their cloaks are designed according to the same visual spectrum as human beings.
Anyway, following your theory on camouflage, a white adult alien (whether by genetic accident or on purpose)
would have an easier time blending into a background heavy with snow. Ah, but thank goodness we won't be having any of
that.