What on earth do you think evolution is?
This is what evolution is. There is no other definition used by biologists.
Oh, I see. Then it is not about one animal species morphing into some other previoulsy never existing animal species. It is just about an animal species making changes to the environment so that they can continue to live in that environment. Sort of like when a dog's coat changes when the season changes from either hot or cold. I get it now.