Watching for the fall bird migration; UW-Stevens Point researcher looks at mercury in birds and humans; Monarch butterfly conservation

First, Bill Volkert, a retired wildlife educator and naturalist, returns to the program to answer your bird questions. Then, we talk with Marie Perkins, a UW-Stevens Point associate professor, about her research on mercury in our wildlife and environment. Finally, Karen Oberhauser shares more about monarch butterflies, just in time for their migration.