i always thought the ''grey aliens'' looked like evolved humans:

humans use our eyes more than our other senses thats why the greys have huge eyes

we dont really use our smell, not like animals who use smell to survive we just use it for, well i dunno candles lol, thats why the greys have no nose

we use our brains more and more and our bodys less and less thats why they have huge heads and little bodys

and im guessing all future humans are freaks because all the abduction things i hear about the aliens are stuffing shit up peoples butts and having sex with them.