When it comes to wings,I feel that we humans perceive "flying" as a difficult
act because we as humans can swim and walk but cant fly...however water and air(the medium of motion) are both
"fluids" and they are both inter-convertible(condenstaion and evaporation)...so if you can understand this "oneness" of water and air,then how difficult is it to imagine that some creatures from water moved into air ?...A fish with fins moves against gravity in water,then why cant it evolve into a bird with wings and move against gravity in air ?

At the bottom of it all,I feel that Creationists feel that the present state and structure of living creatures is very complex and it cannot have been evolved...but think of a modern PC...slowly built from the first PC by Babel(?)
into the PC ur typing away right now...now I know that a PC was "created" but I'm only talking about the idea of "change" of the PC over years to the current state