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Evolution is the result of the tendency for some organisms to have better reproductive success than others -- natural selection.

Evolution is the process by which modern organisms have descended from ancient ancestors. Evolution is responsible for both the remarkable similarities we see across all life and the amazing diversity of that life

Descent and the genetic differences that are heritable and passed on to the next generation; Mutation, migration (gene flow), genetic drift, and natural selection as mechanisms of change; The importance of genetic variation; The random nature of genetic drift and the effects of a reduction in genetic variation; How variation, differential reproduction, and heredity result in evolution by natural selection; and How different species can affect each other's evolution through coevolution.

In fact, some birds may be evolving shorter wings to let them navigate traffic more safely.

Well, the most surprising thing was that the wing length on these road kill birds was longer than on a sample of birds that had died accidentally in mist nets. And we think that these net fatalities probably represent a sample of the population at large. So when we compared the road kills with the population at large, we found that the road kills had significantly longer wings.