The same account which is given of monstrous births in individual cases can be given of monstrous races. For God, the Creator of all, knows where and when each thing ought to be, or to have been created, because He sees the similarities and diversities which can contribute to the beauty of the whole. But He who cannot see the whole is offended by the deformity of the part, because he is blind to that which balances it, and to which it belongs. We know that men are born with more than four fingers on their hands or toes on their feet: this is a smaller matter; but far from us be the folly of supposing that the Creator mistook the number of a mans fingers, though we cannot account for the difference. And so in cases where the divergence from the rule is greater. He whose works no man justly finds fault with, knows what He has done. At Hippo-Diarrhytus there is a man whose hands are crescent-shaped, and have only two fingers each, and his feet similarly formed. - Augustine, The City Of God and Christian Doctrine
Start counting the digits on old photos?