By looking at our vestigial tailbone—the coccyx—we can trace back the history of human and primate evolution. Unlike all other primates, apes don't have a tail, but when did our ancestors lose this potentially useful appendage? Paleoanthropologist Holly Dunsworth introduces Neil Shubin to Proconsul, a fossil ape that provides some answers to that question.
Visit our website to find full episodes of Your Inner Fish. Due to international distribution restrictions, these programs can only be streamed in the United States and Canada.