maybe they could fit more greys on a planet if they are small instead of fat?
no just kidding, i really don't have a clue so good post mate !

Originally posted by MMRabung
I remember seeing a very interesting sketch an artist had done about the evolution of a Grey alien. It started out as a prehistoric raptor and had a couple stages inbetween. I searched all over and could not find this sketch. Anyone else know what I am talking about?
Their skin can be warm or cold, wet or dry. Skin colors are gray, white, tan, brown, gold, yellow, green, blue, pink, orange, red or black, along with other shades in between. Their eyes can look like a human, cat, lizard, insect, alien, etc. Some have fingernails and some don't. Some have webbed fingers and others have suction cups for fingertips or claws or pincers. Some aliens have skin that glows in the dark.