Are you serious???
There is a very clear case described in many biology text booksabout moths that lived in Manchester, England. The moths were predominantely white. As the industiral revolution occurred, the area became more polluted and the moths were in danger because they were so visible. At some point, a random mutation occurred and some of the moths emerged darker than their parents. The darker moths were more successful because they couldn't been seen (and subsequently eaten) as easily. Now, all of this specific type of moth are dark. Evolution at work.