As their name indicates, tundra swans raise their young on the treeless Arctic tundra. But in winter, thousands of these majestic white waterbirds are right here, in Pennsylvania. Biologists don't know what paths swans take on their annual migrations, whether they return to the same places year after year, or how well they survive during their time here. Fly along with PA Game Commission biologists as they conduct an airborne swan survey along the Susquehanna.