How animals adapt to living in cold environments detailed anwer?

Well it's called Evolution, but some people dont believe in evolution because they believe god made everything the same way it's today, they are known as Creationists, and people who believe in evolution are called Evolutionists. Today there is a huge debate between which one is correct and which one is false. I understand the last parts have nothing to do with the question but it's important information about the subject none the less.