Throwback TV: Backstage at the Beaver Pond

Could a beaver win a race against champion Olympic swimmer Michael Phelps? Join a vintage nature film shoot at a beaver pond to find out, and learn other little-known facts about one of the world's biggest rodents.

With Throwback TV, relive classic National Geographic TV moments and get extra behind-the-scenes details and trivia. Look for a new clip every month at nationalgeographic.com/tbtv.