“Homologous” traits, in contrast, may or may not have a common function, but they descended from a common ancestor and hence have some common structure that bespeaks their being “the same” organ. The wing of a bat, the front leg of a horse, the flipper of a seal, the claw of a mole, and the hand of a human have very different functions, but they are all modifications of the forelimb of the ancestor of all mammals,
