Thanks for this post, I can understand micro-evolution, for instance a certain shade of fur being harder for predators to find, but can you walk me through macro-evolution? If birds had not evolved yet, and say there was a mouse like creature that would evolve into a bird... The only time a wing could develop (in my mind) would be during fetal development. Imagining a mouse would give birth to a bird is ridiculous. So let's say we get a mouse who has a chromosomal defect that gives him two little wing stubs on his back. While he has these, he is at a disadvantage against predators, they slow him down and get caught on things. Supposing he survives to maturity and mates, what are the chances that his defect is passed down to his descendents? If it does, his line would have to survive and thrive through thousands of generations and thousands of defects that form the beak, feathers, hollow bones etc. What are your thoughts?