"The parent moths have the genetic ability to give birth to both black and white speckled moths."
Well said and to the point. The genome ALREADY existed for both color schemes. One did not develope by mutation or other mechanisms of genetic change. One was simply selected for by changing enviromental conditions - it did not develope as result of those conditions - the genes already existed. Natural selection serves to preserve a species, not create new ones. Of course, I'm not saying anything here that hasn't been said a million times already - I don't know why I bother.
Apparently the same is true for Darwin's finches.
Not true. There ARE separate species of finches identified, all from a common ancestor. Read the link from post #55.