Well, did this out of some thoughts, some dark and some funny ^^. Lets say, not every bird can fly, but it's not fair to say it's not a bird, it's kind of metaphoric...and what about the frog ?! he's flying, even though he isn't...so, i think you'll get the meanings

basescribble is pencil on 120 gramms/scanned/colored inked PS & Wacom...

hope you like it c&c welcomed !
Cheers Herne