Give an example. Bear in mind that critics of evolution like Behe and Dembski's webmaster (if not Dembski himself) accept common descent as a fact. Common descent is as much a fact as the earth orbiting the sun.
All of the bits and pieces of evolution are facts -- a couple dozen varieties of mutation and DNA change, differential reproductive success, ERVs. There is no phenomenon required for evolution that has not been observed. Evolution has been observed in detail in the laboratory in reproducible experiments.
I see that in citiing a link, you've resorted to the old bait and switch of the evolutionist: providing scientific proof of environmental adaptation by a species and attempting to claim that this somehow provides proof of the descent of all life from a single common ancestor over billions of years.