[grobdriver]

"There's a problem in explaining how the intermediate forms leading up to flight are selected for. How do you get an animal with little dinky wings to fly?"

They have to run very fast. Aerodynamics 101
This from a scientist?

[AndrewC]

I get it! Two legs and two flapping arms are better for climbing surfaces than are four grasping appendages. Sounds logical!

[LiteKeeper]

Here's a novel thought: maybe they were designed that way by an intelligent being that designed everything else around us. Genesis 1:20-21