And I know you're gonna say, "But microscopic changes do help a creature! Color makes a huge difference!". Think about the wing. Can you fly without a fully formed wing? Can you or can't you?
Sure color can make a huge difference. Ever heard of the flight of the Peppered Moth?
Do flying fish, flying squirrels, flying snakes count?
How about penguins, ostriches, dodo's...(oh wait they didn't make it). Are they birds?
Dodged the question with an example of a flying squirrel. Good try, but again, we are talking about birds. Ostriches do not count. Put the steps in your head of the wing evolving. Let's start with the first step. What did the very first step look like? Any ideas?