Why Is Our Skeleton On the Inside?

PBS Member Stations rely on viewers like you. To support your local station, go to: ↓ More info and sources below ↓ We’re on PATREON! Join the community ►► SUBSCRIBE so you don’t miss a video! ►► Having bones is pretty cool. They make our blood, let us hear, and keep us from being just a squishy puddle on the floor. But for every species with bones, there are at least 20 species on Earth with exoskeletons instead. And those exoskeleton animals are incredibly tough and strong. So why don’t WE have our skeletons on the outside? This is the story of bones!