Coccyx is a small triangle-shaped bone at the base of the spinal column in humans and other apes, such as gibbons, orangutans, gorillas, and chimpanzees. Representing a vestigial tail and most commonly called the tailbone, coccyx was the name given to this part of our anatomy by ancient Greek physician Galen because of its resemblance to an animal, making the word an "animalogy." Can you guess the etymology? All is revealed in this episode of Animalogy, a podcast about language and the animal-related words and expressions we use every day. More at AnimalogyPodcast.com.