Ferns evolved during the age of fish: 360 million years ago. They have endured climate changes and other cataclysmic events. They have watched a parade of other species evolve and become extinct. What makes them so durable?

"Falls Trail" is 13-part series featuring Ken Lavin, Burt Bogardus, Paul Cardinet, and Jenn Roe. Presented by Mount Diablo Interpretive Association in partnership with Save Mount Diablo.