I have just been reading an interesting article on vestigial organs - structures within the body that now have a different or indeed no remaining function.  Examples might include the appendix in humans - which is the remains of an organ that would have, in the distant past, been used to digest cellulose foods such as grass or the little nub-like wings of the kiwi.  The theory of evolution predicts that one will find vestigial DNA - and so we have;