How tiny corals build underwater cities!

Did you know a coral reef, one of the largest structures ever built by a living creature, is made by an animal smaller than a grain of rice!? And that corals aren't plants or rocks at all, but tiny animals related to jellyfish and sea anemones!? In this episode, marine scientist Dr. Mike Henley from the Smithsonian's National Zoo and Conservation Biology Institute joins Orbit to explore the underwater world of coral reefs! Learn how thousands of tiny coral polyps build a single reef, how cora...