What can be more curious than that the hand of a man, formed for grasping, that of a mole for digging, the leg of the horse, the paddle of the porpoise, and the wing of the bat, should all be constructed on the same pattern?
Charles Darwin (1872). “The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life”, p.441
