[@Forsythe] Man, I knew my science was off. I was kinda taking inspiration from a documentary in which they envision what aliens would look like on another planet. But I guess there simply isn't enough room for enough helium. The ones I saw using helium was practically 75% gas and was about the size of a truck. I guess I'll have to think of something else.

Initially, I wanted to have some kind of an anti-gravity substance in their scales. But I thought it might be too outlandish. Vacuum on the other hand... I'm not sure. I thought vacuum does not contribute to lift?

But anyway, I'll think of something :D. Maybe the anti-gravity substance won't be so implausible. I mean, they recently found some kind of a substance in a species of crab that's harder than steel alloy, so... Maybe I could take a page from Sid Meier's Civilization: Beyond Earth?

Smart emo ravens is a somewhat accurate description :)