homologous structures share a similar anatomical structure and origin but may perform different functions (divergent evolution). The text explicitly mentions that the forelimbs of whales, bats, cheetahs, and humans share similarities in the pattern of bones (humerus, radius, ulna, carpals, metacarpals, and phalanges) . The wing of a bird is also a modified forelimb with this same fundamental bony arrangement. Therefore, the wing of a bird and the flipper of a whale are homologous structures. In contrast, the wing of a moth (insect) is analogous to a bird's wing .