“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, Origin of Species
Bats have them. So do cats, elephants, and frogs. What are we talking about? Hands! But human hands are set apart from the rest. The dexterity of human hands has long been believed to be what sets us apart from the animals and lies behind our success as a species.