These examples illustrate how mutations, the only possible means of progressive evolution, are nearly always not beneficial, but detrimental instead. While micro-evolution can explain things like feathered legs, crests, different comb types, different plumage coloration, etc., it could never explain how life began or how a single celled organism could develop into a bird or animal, much less a human being, because major mutations are nearly always fatal. After all these changes within the species, we still have chickens, not something else.
Nor can it explain how one "kind" evolves into another "kind," e.g., a reptile turning into a bird or a rabbit turning into a dog. While we have many extinct species, there are no intermediate forms in the fossil record - according the head curator of the largest fossil collection in the world at the British Museum of Natural History. The latter is called macro-evolution, the fairy tale for adults (in my opinion) that started with Darwin and has led to countless negative socio-economic consequences. Hitler, for example, was highly influenced by Darwinian theory and so was Margaret Sanger. Having studied this issue for about the last 30-40 years I came to the conclusion that it takes much more faith to believe in macro-evolution than it does to believe in intelligent design by a creator, the supreme being we call God. And I just don't have enough faith to be an atheist.