The dolphin's fin, the bat's wing and the human hand all contain a five-fingered bone structure. This similarity has for a long time been put forward in evolutionist schoolbooks or popular publications as evidence they all evolved from a common ancestor. Genetic research, however, has shown that these organs, which seem so alike on the surface, are actually controlled by very different genes. Evolutionists today admit that "similar organs do not represent evidence of evolution." (see The Fall of the Homology in Tetrapod Limbs)